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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
I've got a 1440 Chinese lathe from Precision Mathews. Its not the cats
meow, but its still better than any other lathe I have. Often when taking facing cuts or parting cuts I like to lock the carriage. The bolt for that is a recessed socket head screw. It works ok, but it seems I am always looking around for the hex key when I want to release it and move the tool away from the stock. Unless I am holding it in my hand the whole time it always takes me a couple seconds longer than I would like to locate where I set it down. I've been thinking about about making a taller head replacement bolt, drilling it for a small vise handle. I've got a bit of 4140QT shaft on hand and a bit of 1/4" 1144 rod. Making it should be no big deal. Any reason why I shouldn't. I'd keep it as low as possible, and make the handle about half the difference in length between a short arm and a long arm hex key that size. Speaking of such I'd also like to lock the cross slide from time to time. There isn't a lock on it, but it does have a tapered gibb that's easily adjustable with a screw at each end. Usually I just keep the gibb adjusted a little bit tighter than is perfectly comfortable to spin the hand wheel, but on heavy roughing cuts it can still back off on longer pieces of stock. I wind up standing there with my hand on the hand wheel and my eye on the DRO the whole time. Is that just the best way to do it? |
#2
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Bob La Londe" wrote in message
... I've got a 1440 Chinese lathe from Precision Mathews. Its not the cats meow, but its still better than any other lathe I have. Often when taking facing cuts or parting cuts I like to lock the carriage. The bolt for that is a recessed socket head screw. It works ok, but it seems I am always looking around for the hex key when I want to release it and move the tool away from the stock. Unless I am holding it in my hand the whole time it always takes me a couple seconds longer than I would like to locate where I set it down. I've been thinking about about making a taller head replacement bolt, drilling it for a small vise handle. I've got a bit of 4140QT shaft on hand and a bit of 1/4" 1144 rod. Making it should be no big deal. Any reason why I shouldn't. I'd keep it as low as possible, and make the handle about half the difference in length between a short arm and a long arm hex key that size. Speaking of such I'd also like to lock the cross slide from time to time. There isn't a lock on it, but it does have a tapered gibb that's easily adjustable with a screw at each end. Usually I just keep the gibb adjusted a little bit tighter than is perfectly comfortable to spin the hand wheel, but on heavy roughing cuts it can still back off on longer pieces of stock. I wind up standing there with my hand on the hand wheel and my eye on the DRO the whole time. Is that just the best way to do it? I bought several 'vintage' box wrenches for square-headed bolts and made replacements for missing lock and clamp screws on my 1965 South Bend to fit them. There's been no problem with the square head carriage lock. When not trying to match a style and period I make as many fasteners as possible on home made machinery fit the same pocketable gear wrench, normally 9/16" for 3/8" bolt heads. The SB has a Threading Stop which is a bar that locks into the dovetail and limits in or outfeed, so the cross slide can be retracted to quickly move the carriage and then run back against the stop for the cut. It serves the same function you are looking for without messing with the gib adjustment. https://www.ebay.com/itm/South-Bend-...-/123733462898 |
#3
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On Sun, 12 May 2019 20:29:25 -0700
Bob La Londe wrote: snip I've been thinking about about making a taller head replacement bolt, drilling it for a small vise handle. I've got a bit of 4140QT shaft on hand and a bit of 1/4" 1144 rod. Making it should be no big deal. Any reason why I shouldn't... Another idea is to make it such that your chuck key fits it... I bought a cheap set of HF metric ratchet wrenches that have reverse on them: https://www.harborfreight.com/4-pc-m...set-68833.html I leave the 12mm on/in the tail stock locking bolt. One more idea -- Leon Fisk Grand Rapids MI |
#4
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Leon Fisk" wrote in message ... On Sun, 12 May 2019 20:29:25 -0700 Bob La Londe wrote: snip I've been thinking about about making a taller head replacement bolt, drilling it for a small vise handle. I've got a bit of 4140QT shaft on hand and a bit of 1/4" 1144 rod. Making it should be no big deal. Any reason why I shouldn't... Another idea is to make it such that your chuck key fits it... **** Not a bad idea, and I do have a location specifically for the chuck key(s), but which chuck key depends on which chuck I have on the lathe. I bought a cheap set of HF metric ratchet wrenches that have reverse on them: https://www.harborfreight.com/4-pc-m...set-68833.html I leave the 12mm on/in the tail stock locking bolt. One more idea **** This lathe has its own lever locking system for the tail stock. I have to adjust it once in a while, btut not tools required to lock it in place, or to adjust the lock. I do leave a 3/4 box end wrench ont eh tailstock clamping bolt on my smaller 8.5x 18 lathe. -- Leon Fisk Grand Rapids MI |
#5
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On 2019-05-13, Bob La Londe wrote:
"Leon Fisk" wrote in message ... On Sun, 12 May 2019 20:29:25 -0700 Bob La Londe wrote: snip I've been thinking about about making a taller head replacement bolt, drilling it for a small vise handle. I've got a bit of 4140QT shaft on hand and a bit of 1/4" 1144 rod. Making it should be no big deal. Any reason why I shouldn't... Another idea is to make it such that your chuck key fits it... **** Not a bad idea, and I do have a location specifically for the chuck key(s), but which chuck key depends on which chuck I have on the lathe. If you have only two lathe chucks -- make a wrench with two ends, and the tommy-bar in the middle. I bought a cheap set of HF metric ratchet wrenches that have reverse on them: https://www.harborfreight.com/4-pc-m...set-68833.html I leave the 12mm on/in the tail stock locking bolt. One more idea Cheap and not capable of much torque -- but quite likely sufficient for your specified needs. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#6
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On 16 May 2019 02:20:55 GMT
"DoN. Nichols" wrote: "Leon Fisk" wrote in message ... snip I bought a cheap set of HF metric ratchet wrenches that have reverse on them: https://www.harborfreight.com/4-pc-m...set-68833.html I leave the 12mm on/in the tail stock locking bolt. One more idea Cheap and not capable of much torque -- but quite likely sufficient for your specified needs. DoN, if you see the tail-stock it makes a lot more sense: https://i.postimg.cc/rFQzNcW0/Lathe-9x20-tailstock.jpg They just give you a bolt head to secure the tail-stock. You can't quite release it with one grab using a standard wrench. So you have fiddle with the wrench on/off the head to both loosen and tighten the tail-stock. I also added a spring underneath between the wedging nut and the stock. Helps to release it a bit sooner. What it really needs is the cam-lock mod but I'm lazy... -- Leon Fisk Grand Rapids MI |
#7
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Leon Fisk" wrote in message ... On 16 May 2019 02:20:55 GMT "DoN. Nichols" wrote: "Leon Fisk" wrote in message ... snip I bought a cheap set of HF metric ratchet wrenches that have reverse on them: https://www.harborfreight.com/4-pc-m...set-68833.html I leave the 12mm on/in the tail stock locking bolt. One more idea Cheap and not capable of much torque -- but quite likely sufficient for your specified needs. DoN, if you see the tail-stock it makes a lot more sense: https://i.postimg.cc/rFQzNcW0/Lathe-9x20-tailstock.jpg They just give you a bolt head to secure the tail-stock. You can't quite release it with one grab using a standard wrench. So you have fiddle with the wrench on/off the head to both loosen and tighten the tail-stock. I also added a spring underneath between the wedging nut and the stock. Helps to release it a bit sooner. What it really needs is the cam-lock mod but I'm lazy... -- Leon Fisk Grand Rapids MI You might try facing the bolt head and nut bearing surfaces square with the shank and threads to see if that makes the tailstock lock and release with less rotation. My lathe's tailstock was refitted with a 1/2-13 bolt that clamps tight (enough) or fully releases in 1/8 of a turn. I found an old wrench like this and made a hex nut+washer that is 0.80" across the flats to fit it. https://www.ebay.com/i/183811511075?chn=ps |
#8
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On Thu, 16 May 2019 12:56:19 -0400
"Jim Wilkins" wrote: snip You might try facing the bolt head and nut bearing surfaces square with the shank and threads to see if that makes the tailstock lock and release with less rotation. My lathe's tailstock was refitted with a 1/2-13 bolt that clamps tight (enough) or fully releases in 1/8 of a turn. I found an old wrench like this and made a hex nut+washer that is 0.80" across the flats to fit it. https://www.ebay.com/i/183811511075?chn=ps I'm sure that wouldn't make it any worse but the main problem is part #1021 rocks around, sloppy below the bed. So if you loosen the bolt slightly (actually the nut I see) and then try to move the tailstock it jams up by going a little cockeyed. The spring I put above #1021 helped by keeping some downward pressure on it. https://i.postimg.cc/k57CcpQD/tailstock-parts.jpg For what I do with it the ratchet wrench and spring combo works good enough -- Leon Fisk Grand Rapids MI |
#9
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Leon Fisk" wrote in message
... On Thu, 16 May 2019 12:56:19 -0400 "Jim Wilkins" wrote: snip You might try facing the bolt head and nut bearing surfaces square with the shank and threads to see if that makes the tailstock lock and release with less rotation. My lathe's tailstock was refitted with a 1/2-13 bolt that clamps tight (enough) or fully releases in 1/8 of a turn. I found an old wrench like this and made a hex nut+washer that is 0.80" across the flats to fit it. https://www.ebay.com/i/183811511075?chn=ps I'm sure that wouldn't make it any worse but the main problem is part #1021 rocks around, sloppy below the bed. So if you loosen the bolt slightly (actually the nut I see) and then try to move the tailstock it jams up by going a little cockeyed. The spring I put above #1021 helped by keeping some downward pressure on it. https://i.postimg.cc/k57CcpQD/tailstock-parts.jpg For what I do with it the ratchet wrench and spring combo works good enough -- Leon Fisk Grand Rapids MI On my lathe that part is a hunk of steel some trade school student hogged out to replace the missing original. I filed and block-sanded it until the end mill marks were the same degree of barely visible all over. I've fitted two surfaces I couldn't machine, a 5HP gas engine and its welding-warped mounting plate on my log splitter, by marking the high spot contacts by pulling sandpaper through and grinding the scratches off with an angle grinder, then filing as the fit improved. I stopped when a feeler gauge 0.003" thick (IIRC) wouldn't go into the open corner, because the offset weight of the engine was interfering with a delicate feel. |
#10
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On Thu, 16 May 2019 15:28:15 -0400
"Jim Wilkins" wrote: snip On my lathe that part is a hunk of steel some trade school student hogged out to replace the missing original. I filed and block-sanded it until the end mill marks were the same degree of barely visible all over. Yeah, it's amazing what you can do with simple hand tools with a bit of training, thought and wana-get-it-done attitude A guide pin or two for that part on my lathe would help a lot. Or so I think it would. If I was moving it often I would probably work on it some more. The real solution for slick operation would be Steve's mod: http://bedair.org/9x20camlock/9x20camlock.html or something similar. There are only a few days a year that I can comfortably work on it or with it. Most of the time I end up taking care of stuff that just won't wait any longer... -- Leon Fisk Grand Rapids MI |
#11
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Leon Fisk" wrote in message
... On Thu, 16 May 2019 15:28:15 -0400 "Jim Wilkins" wrote: snip On my lathe that part is a hunk of steel some trade school student hogged out to replace the missing original. I filed and block-sanded it until the end mill marks were the same degree of barely visible all over. Yeah, it's amazing what you can do with simple hand tools with a bit of training, thought and wana-get-it-done attitude A guide pin or two for that part on my lathe would help a lot. Or so I think it would. If I was moving it often I would probably work on it some more. The real solution for slick operation would be Steve's mod: http://bedair.org/9x20camlock/9x20camlock.html or something similar. There are only a few days a year that I can comfortably work on it or with it. Most of the time I end up taking care of stuff that just won't wait any longer... -- Leon Fisk Grand Rapids MI Here's something similar that requires no change to the tailstock. I made adjustable cam lock clamps for a sheetmetal brake using this type of fixture bolt: http://valtrainc.com/products/jlb.php The cam is 1.250" drill rod, cut about 3x the thickness of the bolt eye long, and cross-drilled 0.050" off center for the pivot pin. The bolt eye fits into a slot milled across the center of the cam, with enough D-shaped thickness left below the slot, connecting the round sides, to drill and tap for the operating handle. On the brake the handle can swing all the way around to run the bolt threads in or out for coarse adjustment to sheetmetal thickness. Since it would have limited rotation on the tailstock you might need a thumb nut underneath to adjust the tension. It can be tightened either by rocking the handle down toward the thicker side of the cam or rotating it to screw the bolt tighter, or both. The feed clutch cam on my South Bend is a very similar design. https://www.practicalmachinist.com/v...ob-mod-129974/ |
#12
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On 2019-05-16, Leon Fisk wrote:
On 16 May 2019 02:20:55 GMT "DoN. Nichols" wrote: "Leon Fisk" wrote in message ... [ ... ] https://www.harborfreight.com/4-pc-m...set-68833.html I leave the 12mm on/in the tail stock locking bolt. One more idea Cheap and not capable of much torque -- but quite likely sufficient for your specified needs. DoN, if you see the tail-stock it makes a lot more sense: https://i.postimg.cc/rFQzNcW0/Lathe-9x20-tailstock.jpg They just give you a bolt head to secure the tail-stock. You can't quite release it with one grab using a standard wrench. So you have fiddle with the wrench on/off the head to both loosen and tighten the tail-stock. Indeed it makes sense. I wish that the nut for my 12x24" Clausing were that accessible. It is in a cavity only accessible from the back of the tailstock. The original design was a lever and cam to pull up the nut, but that is not with mine (lost before I got the tailstock) and no longer stocked by Clausing last I asked. So, I have a slip-on hex wrench made for a Logan, with a long hex nut, with the center of the hex turned to a cylinder so I can pull the wrench up a bit and slip it to the next teeth in the socket. (No, I can't get to the back easily enough to switch the ratchet direction on your inexpensive wrenches. Maybe I can make a remote for the reverse switch and then use your wrench type for the task. Pretty much everything else in the lathe uses a single square head which fits the supplied wrench. (The other end of the wrench accesses the nuts holding the compound adjustment at need.) For yours, what about making something to fit in the other end which is hex of the right size for the wrench and has an extension also hex (or square if so needed) to fit the carriage lock -- and if necessary, Loctite it into the hex socket in the wrench. That way, one wrench for both jobs. I also added a spring underneath between the wedging nut and the stock. Helps to release it a bit sooner. Great idea. What it really needs is the cam-lock mod but I'm lazy... Someday ... :-) Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#13
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On 18 May 2019 01:27:57 GMT
"DoN. Nichols" wrote: snip The original design was a lever and cam to pull up the nut, but that is not with mine (lost before I got the tailstock) and no longer stocked by Clausing last I asked. So, I have a slip-on hex wrench made for a Logan, with a long hex nut, with the center of the hex turned to a cylinder so I can pull the wrench up a bit and slip it to the next teeth in the socket. (No, I can't get to the back easily enough to switch the ratchet direction on your inexpensive wrenches. Maybe I can make a remote for the reverse switch and then use your wrench type for the task. One of Jim's good ideas (thanks, knowledge is good!) got me to thinking I'd seen cammed bolts used on bicycle wheels and seat posts... On a hunch I searched McMaster and found these: https://www.mcmaster.com/#cams/=ae27...08aabejvttr64k If the link doesn't work (McMaster links are always iffy) search on "cams" then "clamping handles". You might want to look through these if you still want to fix your tailstock. Might get lucky and spot a version that would work For yours, what about making something to fit in the other end which is hex of the right size for the wrench and has an extension also hex (or square if so needed) to fit the carriage lock -- and if necessary, Loctite it into the hex socket in the wrench. That way, one wrench for both jobs. The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... -- Leon Fisk Grand Rapids MI |
#14
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Leon Fisk" wrote in message
... ... The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... -- Leon Fisk Grand Rapids MI Personally I'd rather have to intentionally take the tool post wrench off its hook to lock the carriage than risk accidentally locking it while threading. |
#15
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On Sat, 18 May 2019 15:50:45 -0400
"Jim Wilkins" wrote: "Leon Fisk" wrote in message ... ... The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... -- Leon Fisk Grand Rapids MI Personally I'd rather have to intentionally take the tool post wrench off its hook to lock the carriage than risk accidentally locking it while threading. That may be why it is so wimpy. So something doesn't break if you forget and don't release it. Yeah, that thought/idea did occur to me. I haven't had any reason to use it so far. Nothing I've done has required that kind of precision... -- Leon Fisk Grand Rapids MI |
#16
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"Leon Fisk" wrote in message
... On Sat, 18 May 2019 15:50:45 -0400 "Jim Wilkins" wrote: "Leon Fisk" wrote in message ... ... The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... -- Leon Fisk Grand Rapids MI Personally I'd rather have to intentionally take the tool post wrench off its hook to lock the carriage than risk accidentally locking it while threading. That may be why it is so wimpy. So something doesn't break if you forget and don't release it. Yeah, that thought/idea did occur to me. I haven't had any reason to use it so far. Nothing I've done has required that kind of precision... -- Leon Fisk Grand Rapids MI I snug the carriage when facing or parting off so I won't move it by bumping the handwheel. |
#17
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On 2019-05-18, Leon Fisk wrote:
On 18 May 2019 01:27:57 GMT "DoN. Nichols" wrote: snip The original design was a lever and cam to pull up the nut, but that is not with mine (lost before I got the tailstock) and no longer stocked by Clausing last I asked. So, I have a slip-on hex wrench made for a Logan, with a long hex nut, with the center of the hex turned to a cylinder so I can pull the wrench up a bit and slip it to the next teeth in the socket. (No, I can't get to the back easily enough to switch the ratchet direction on your inexpensive wrenches. Maybe I can make a remote for the reverse switch and then use your wrench type for the task. One of Jim's good ideas (thanks, knowledge is good!) got me to thinking I'd seen cammed bolts used on bicycle wheels and seat posts... On a hunch I searched McMaster and found these: https://www.mcmaster.com/#cams/=ae27...08aabejvttr64k If the link doesn't work (McMaster links are always iffy) search on "cams" then "clamping handles". You might want to look through these if you still want to fix your tailstock. Might get lucky and spot a version that would work As predicted -- the link did not work. They are of short duration, I think -- generated after your search -- and sent away sometime after you leave the side. :-) And my older Firefox was having problems (with lots of security stuff enabled), so I went to a linux-based one and managed to find what you were talking about. Looking at them -- most of them are too small (max 3/8" thread and mine needs a 1/2-13 thread), and would be really difficult to feed into the hole. The original (still have the bolt) had a carriage bolt head for anti-rotation under the locking plate, and the thread passed up into the tailstock -- a cavity between the plate and the housing for the ram. The lever went around that and passed into a hinged plate on top of the lever, and a nut went on top of that all to adjust where the lever actually locked the carriage. The only ones big enough (the "heavy duty" ones) either have a long threaded stud sticking down (I would have to put a nut on under the plate -- which is quite difficult to get to -- and a real pain to remove again when the time comes to swap in the bed turret for the tailstock. The lever appears to have to stick straight up for maximum clamping (no room given the barrel the ram runs in). Sort of a crowded room between the barrel and the carriage plate. I have one without the stud -- which I would have to spend some hours grinding to the right profile (a fairly short travel of the lever from locked to loose), and make a guide for the screw and a thrust surface on the top for the nut to bear on. The one without the stud came from MSC a number of years ago. At least it is a start on the size needed. I may someday do that. For yours, what about making something to fit in the other end which is hex of the right size for the wrench and has an extension also hex (or square if so needed) to fit the carriage lock -- and if necessary, Loctite it into the hex socket in the wrench. That way, one wrench for both jobs. The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... M6 is rather small -- and that wrench would make it easy to wring off the head. Maybe turn your own screw for it -- with a flange below the hex so you could rest the wrench on it -- and a hex large enough for a smaller version of the ratchet wrench. Good Luck, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#18
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"DoN. Nichols" wrote in message
... On 2019-05-18, Leon Fisk wrote: On 18 May 2019 01:27:57 GMT "DoN. Nichols" wrote: snip The original design was a lever and cam to pull up the nut, but that is not with mine (lost before I got the tailstock) and no longer stocked by Clausing last I asked. So, I have a slip-on hex wrench made for a Logan, with a long hex nut, with the center of the hex turned to a cylinder so I can pull the wrench up a bit and slip it to the next teeth in the socket. (No, I can't get to the back easily enough to switch the ratchet direction on your inexpensive wrenches. Maybe I can make a remote for the reverse switch and then use your wrench type for the task. One of Jim's good ideas (thanks, knowledge is good!) got me to thinking I'd seen cammed bolts used on bicycle wheels and seat posts... On a hunch I searched McMaster and found these: https://www.mcmaster.com/#cams/=ae27...08aabejvttr64k If the link doesn't work (McMaster links are always iffy) search on "cams" then "clamping handles". You might want to look through these if you still want to fix your tailstock. Might get lucky and spot a version that would work As predicted -- the link did not work. They are of short duration, I think -- generated after your search -- and sent away sometime after you leave the side. :-) And my older Firefox was having problems (with lots of security stuff enabled), so I went to a linux-based one and managed to find what you were talking about. Looking at them -- most of them are too small (max 3/8" thread and mine needs a 1/2-13 thread), and would be really difficult to feed into the hole. The original (still have the bolt) had a carriage bolt head for anti-rotation under the locking plate, and the thread passed up into the tailstock -- a cavity between the plate and the housing for the ram. The lever went around that and passed into a hinged plate on top of the lever, and a nut went on top of that all to adjust where the lever actually locked the carriage. The only ones big enough (the "heavy duty" ones) either have a long threaded stud sticking down (I would have to put a nut on under the plate -- which is quite difficult to get to -- and a real pain to remove again when the time comes to swap in the bed turret for the tailstock. The lever appears to have to stick straight up for maximum clamping (no room given the barrel the ram runs in). Sort of a crowded room between the barrel and the carriage plate. I have one without the stud -- which I would have to spend some hours grinding to the right profile (a fairly short travel of the lever from locked to loose), and make a guide for the screw and a thrust surface on the top for the nut to bear on. The one without the stud came from MSC a number of years ago. At least it is a start on the size needed. I may someday do that. For yours, what about making something to fit in the other end which is hex of the right size for the wrench and has an extension also hex (or square if so needed) to fit the carriage lock -- and if necessary, Loctite it into the hex socket in the wrench. That way, one wrench for both jobs. The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... M6 is rather small -- and that wrench would make it easy to wring off the head. Maybe turn your own screw for it -- with a flange below the hex so you could rest the wrench on it -- and a hex large enough for a smaller version of the ratchet wrench. Good Luck, DoN. A "ferry head" bolt like this might work: https://www.pegasusautoracing.com/pr...sp?RecID=10467 The extra points should help keep a 5/16" or 8mm box end wrench from falling off. |
#19
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Carriage lock screw - Any reason not to
On 20 May 2019 01:42:07 GMT
"DoN. Nichols" wrote: snip The only ones big enough (the "heavy duty" ones) either have a long threaded stud sticking down (I would have to put a nut on under the plate -- which is quite difficult to get to -- and a real pain to remove again when the time comes to swap in the bed turret for the tailstock. The lever appears to have to stick straight up for maximum clamping (no room given the barrel the ram runs in). Sort of a crowded room between the barrel and the carriage plate... I suspected that it was a whole lot more complicated and a generic drop in wouldn't be a simple fix. Or you would have done it already M6 is rather small -- and that wrench would make it easy to wring off the head. Maybe turn your own screw for it -- with a flange below the hex so you could rest the wrench on it -- and a hex large enough for a smaller version of the ratchet wrench. It annoyed me when I first saw how it was made. But frankly I just don't use it enough for it to be a problem. I now have Your's, Jim's and my own ideas on how it could be made better if it becomes cumbersome in the future... -- Leon Fisk Grand Rapids MI |
#20
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
On 2019-05-20, Jim Wilkins wrote:
"DoN. Nichols" wrote in message ... On 2019-05-18, Leon Fisk wrote: On 18 May 2019 01:27:57 GMT [ ... ] The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... M6 is rather small -- and that wrench would make it easy to wring off the head. Maybe turn your own screw for it -- with a flange below the hex so you could rest the wrench on it -- and a hex large enough for a smaller version of the ratchet wrench. Good Luck, DoN. A "ferry head" bolt like this might work: https://www.pegasusautoracing.com/pr...sp?RecID=10467 The extra points should help keep a 5/16" or 8mm box end wrench from falling off. I've got a number of these in SS -- 5/16" and 1/4" -- which were one-time use bolts for vacuum systems -- the reason for one-time use is that the whole system had to be heated to burn out deposits on the surface of the enclosure. And the seals were knife-edges which bit into either side of soft copper gaskets -- also one-time use. :-) I *think* that the real reason for that head was that it was stronger when torquing the bolts to proper tension. Enjoy, DoN. -- Remove oil spill source from e-mail Email: | (KV4PH) Voice (all times): (703) 938-4564 (too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html --- Black Holes are where God is dividing by zero --- |
#21
Posted to rec.crafts.metalworking
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Carriage lock screw - Any reason not to
"DoN. Nichols" wrote in message
... On 2019-05-20, Jim Wilkins wrote: "DoN. Nichols" wrote in message ... On 2019-05-18, Leon Fisk wrote: On 18 May 2019 01:27:57 GMT [ ... ] The carriage lock on mine is really rinky-dink. Just a tiny little M6 cap screw that uses a small hex key. I'd have to take a serious look at it for possible hazards but that would be a nice place to put a cam lock of some sort... M6 is rather small -- and that wrench would make it easy to wring off the head. Maybe turn your own screw for it -- with a flange below the hex so you could rest the wrench on it -- and a hex large enough for a smaller version of the ratchet wrench. Good Luck, DoN. A "ferry head" bolt like this might work: https://www.pegasusautoracing.com/pr...sp?RecID=10467 The extra points should help keep a 5/16" or 8mm box end wrench from falling off. I've got a number of these in SS -- 5/16" and 1/4" -- which were one-time use bolts for vacuum systems -- the reason for one-time use is that the whole system had to be heated to burn out deposits on the surface of the enclosure. And the seals were knife-edges which bit into either side of soft copper gaskets -- also one-time use. :-) I *think* that the real reason for that head was that it was stronger when torquing the bolts to proper tension. Enjoy, DoN. http://www.oilfieldwiki.com/wiki/Fer..._%26_Set_Screw |
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