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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
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Radius slot in O-1
Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the
center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. |
#2
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Radius slot in O-1
"Tom Gardner" wrote in message m... Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. How many do you need to make? Do the rads have to be true and without any sharp edges, or are they only cosmetic? How close to 1/16" do they have to be? I'd use a die grinder, then stone, then emery cloth/paper. 5 minutes max. start to finish (per rad). This is assuming you cannot find an appropriate radius cutter and/or need a true rad with a good surface finish. Regards, Robin |
#3
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Radius slot in O-1
You could take an old end mill, cut away al but one of the flutes then hand
grind the 1/16 r in the remaining flute aking it a single point cutter. A little time consuming, but faster than hand work. -- J Miller "Tom Gardner" wrote in message m... Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. |
#4
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Radius slot in O-1
On Wed, 12 Apr 2006 02:52:07 GMT, "Tom Gardner"
wrote: Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. let me check my Stuff..may have one Gunner, who just finished putting the tranny (new throwout bearing and slave (wrapped around the pilot shaft..and pilot bearing) back in his truck..and no..the grease and hammer trick didnt work..damnit Gunner "I think this is because of your belief in biological Marxism. As a genetic communist you feel that noticing behavioural patterns relating to race would cause a conflict with your belief in biological Marxism." Big Pete, famous Usenet Racist |
#5
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Radius slot in O-1
Tom Gardner wrote:
Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. A 1/16 round over end mill should be a stock size. I know for a fact that we have about six or 7 of them in our cutter bin at work. You might be best off just phoning a (relatively) local supplier and asking, but MSC will probably have them. Lesse.... McMaster Carr item 3067A11 in hss, 2790A71 in cobalt steel. Pg.2249 in cat #107 So these numbers may or may not be any good. Cheers Trevor Jones |
#6
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Radius slot in O-1
"Trevor Jones" wrote in message ... Tom Gardner wrote: Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. A 1/16 round over end mill should be a stock size. I know for a fact that we have about six or 7 of them in our cutter bin at work. You might be best off just phoning a (relatively) local supplier and asking, but MSC will probably have them. Lesse.... McMaster Carr item 3067A11 in hss, 2790A71 in cobalt steel. Pg.2249 in cat #107 So these numbers may or may not be any good. Cheers Trevor Jones It helps to be looking for something using the right name for it...Duhh. What catalog do you have? I have 111 and 112 and I found the mill but nowhere near your page numbers. (How do you like that, I now get a new catalog from them every year rather than every other year as before...I'm quite impressed with their service and even their prices lately.) |
#7
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Radius slot in O-1
Tom Gardner wrote:
Lesse.... McMaster Carr item 3067A11 in hss, 2790A71 in cobalt steel. Pg.2249 in cat #107 So these numbers may or may not be any good. Cheers Trevor Jones It helps to be looking for something using the right name for it...Duhh. What catalog do you have? I have 111 and 112 and I found the mill but nowhere near your page numbers. (How do you like that, I now get a new catalog from them every year rather than every other year as before...I'm quite impressed with their service and even their prices lately.) Uhhhh.... That would be cat # 107, same as before. :-) Cheers Trevor Jones |
#8
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Radius slot in O-1
Uhhhh.... That would be cat # 107, same as before.
:-) Cheers Trevor Jones I was just testing you to see if you would stick to your story. |
#9
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Radius slot in O-1
According to Tom Gardner :
Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one of the sides. The last one of these I made took hours with itsy-bitsy (technical term) files and emery paper. I have a "Round-over" end mill with a 1/2" radius but I've never seen one that small. Do they exist? I DID Google and looked at catalogs for all the usual mill suppliers. I could make it in two parts but that would be a wash, time wise. It sounds to me as though you would do better in cutting the slot with a conventional milling cutter (for a horizontal spindle mill) instead of an endmill, and while we're about it, (assuming that you will be making enough of these to make it worthwhile) you can get another milling cutter a bit wider reground by a good sharpener to produce the radius on both sides at the same time. Perhaps even one could be ground to produce the slot at full depth and both radii in a single pass, so you don't have to be constantly changing cutters. Good Luck, DoN. -- Email: | 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 --- |
#10
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Radius slot in O-1
"DoN. Nichols" wrote in message ... you don't have to be constantly changing cutters. Or build a simple fixture to run both (or all three) cutters at once. If the run was long enough, a fixture could be made to hold multiple parts for each operation. This of course assumes the part would be run on a proper horizontal using an arbour with the ground spacer bushings. I'm not sure having one cutter for both the slot and the rad would be a great idea. If each rad and the slot are cut individually, all the cutters are probably off-the-shelf. Specially ground cutters are expensive to buy, expensive to sharpen, and expensive to replace in the case of a crash. Regards, Robin |
#11
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Radius slot in O-1
"Tom Gardner" wrote in message . com... I only have to make one Don, and the slot is already done with a cutter. It doesn't seem economical to buy any specific tooling for this part if you one need one unit. It sounds like the actual dimension and form of the rad is somewhat unimportant, as long as there is something there to catch your wire. If I didn't have a die grinder, I'd use a file too. Why did it take 2 hours of bench work last time (perhaps I'm missing something)? Regards, Robin |
#12
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Radius slot in O-1
According to Tom Gardner :
"DoN. Nichols" wrote in message ... According to Tom Gardner : Imagine a 1" cube of O-1 with a 1/8" slot milled 9/16 deep through the center of a face. I need to put a 1/16" radius on the two edges on one [ ... ] It sounds to me as though you would do better in cutting the slot with a conventional milling cutter (for a horizontal spindle mill) instead of an endmill, and while we're about it, (assuming that you will be making enough of these to make it worthwhile) you can get another milling cutter a bit wider reground by a good sharpener to produce the radius on both sides at the same time. Perhaps even one could be ground to produce the slot at full depth and both radii in a single pass, so you don't have to be constantly changing cutters. [ ... ] I only have to make one Don, and the slot is already done with a cutter. I just need to radius the sides of the slot. The part will be a guide for .110" x .017" flat wire that will be poking into the slot from about a half inch away, very fast. Then the wir gets cut and pulled out...kinda'. The radius is only to keep the cut edges from hanging-up as it gets inserted into the slot in the block and make sure it ends up in position. O.K. For that, you could live with a bevel cut with a 90 degree conventional milling cutter doing both sides at once -- or even using a countersink as an end mill. (Yes - I have done that last -- before I had my horizontal mill and some of the interesting cutter shapes. Enjoy, DoN. -- Email: | 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
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Radius slot in O-1
According to Robin S. :
"DoN. Nichols" wrote in message ... you don't have to be constantly changing cutters. Or build a simple fixture to run both (or all three) cutters at once. If the run was long enough, a fixture could be made to hold multiple parts for each operation. This of course assumes the part would be run on a proper horizontal using an arbour with the ground spacer bushings. I'm not sure having one cutter for both the slot and the rad would be a great idea. If each rad and the slot are cut individually, all the cutters are probably off-the-shelf. Specially ground cutters are expensive to buy, expensive to sharpen, and expensive to replace in the case of a crash. You could even stack the two radius cutters and the slotting cutter to do it all in one pass -- except that the conventional radius cutters which I have seen tend to have a bit too much meat to even go into the 1/8" slot, which is why I was suggesting a custom tool. Enjoy, DoN. -- Email: | 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 --- |
#14
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Radius slot in O-1
It doesn't seem economical to buy any specific tooling for this part if you one need one unit. It sounds like the actual dimension and form of the rad is somewhat unimportant, as long as there is something there to catch your wire. If I didn't have a die grinder, I'd use a file too. Why did it take 2 hours of bench work last time (perhaps I'm missing something)? Regards, Robin The slot is only 1/8 and it's hard to get a good swipe at it with the files and the O-1 is tough and I'm lazy and I bore easily. But, the first one has been in service for 18 months and still perfectly smoothe. I'll buy the $34 mill from MC, it's solid carbide and there are two more similar parts I need to make so I can justify it. This machine will make me the largest producer of flat wire brushes in the world! Bwahhahahah! http://www.bakedeco.com/a/butcher-block-brush-4439.htm |
#15
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Radius slot in O-1
O.K. For that, you could live with a bevel cut with a 90 degree conventional milling cutter doing both sides at once -- or even using a countersink as an end mill. (Yes - I have done that last -- before I had my horizontal mill and some of the interesting cutter shapes. Enjoy, DoN. I've heard about you and your "Interesting Shapes"! ....I could use a 90 deg cutter and...maybe I won't spend the$34. |
#16
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Radius slot in O-1
On Fri, 14 Apr 2006 23:44:51 GMT, "Tom Gardner"
wrote: If one piece is all that is needed, just dress a concave radius in a wheel, and do the job on a surface grinder. John Normile I only have to make one Don, and the slot is already done with a cutter. I just need to radius the sides of the slot. The part will be a guide for .110" x .017" flat wire that will be poking into the slot from about a half inch away, very fast. Then the wir gets cut and pulled out...kinda'. The radius is only to keep the cut edges from hanging-up as it gets inserted into the slot in the block and make sure it ends up in position. |
#17
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Radius slot in O-1
John Normile wrote: On Fri, 14 Apr 2006 23:44:51 GMT, "Tom Gardner" wrote: If one piece is all that is needed, just dress a concave radius in a wheel, and do the job on a surface grinder. John Normile I only have to make one Don, and the slot is already done with a cutter. I just need to radius the sides of the slot. The part will be a guide for .110" x .017" flat wire that will be poking into the slot from about a half inch away, very fast. Then the wir gets cut and pulled out...kinda'. The radius is only to keep the cut edges from hanging-up as it gets inserted into the slot in the block and make sure it ends up in position. Just buttin in...ever thought of using ceramic wire guides, Tom? Seems to me I saw a guide that was pretty darned close to what you have described at the wire convention in Atlanta a few years back. Unfortunately, the company name eludes me now. With all the various wire guides you use, there may be an off the shelf solution available. Ceramic guides do last one heck of a long time but of course, must me mounted in a steel backer of some sort. Not exactly right for what you are speaking of but one example for a 10 second search: http://ceramtex.com/slottedeyelets Koz |
#18
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Radius slot in O-1
In article ,
says... Not exactly right for what you are speaking of but one example for a 10 second search: http://ceramtex.com/slottedeyelets I was thinking the same thing, though it sounds like these guides may take a beating, so carbide might be better. I've used both ceramic and carbide eyelets and guides from these folks... http://www.wireguides.com/Products/finishIntro.html I don't see anything there that looks like what I'm imagining from Tom's decription, but they do specials, and delivery isn't too bad. Ned Simmons |
#19
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Radius slot in O-1
Just buttin in...ever thought of using ceramic wire guides, Tom? Seems to
me I saw a guide that was pretty darned close to what you have described at the wire convention in Atlanta a few years back. Unfortunately, the company name eludes me now. With all the various wire guides you use, there may be an off the shelf solution available. Ceramic guides do last one heck of a long time but of course, must me mounted in a steel backer of some sort. Not exactly right for what you are speaking of but one example for a 10 second search: http://ceramtex.com/slottedeyelets Koz Hmmmm?! |
#20
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Radius slot in O-1
Thanks, bookmarked!
"Ned Simmons" wrote in message ... In article , says... Not exactly right for what you are speaking of but one example for a 10 second search: http://ceramtex.com/slottedeyelets I was thinking the same thing, though it sounds like these guides may take a beating, so carbide might be better. I've used both ceramic and carbide eyelets and guides from these folks... http://www.wireguides.com/Products/finishIntro.html I don't see anything there that looks like what I'm imagining from Tom's decription, but they do specials, and delivery isn't too bad. Ned Simmons |
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