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Woodturning (rec.crafts.woodturning) To discuss tools, techniques, styles, materials, shows and competitions, education and educational materials related to woodturning. All skill levels are welcome, from art turners to production turners, beginners to masters. |
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#1
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Musing about single chucking vs reverse chucking.
Sometimes I drill a mortise in a blank for expansion chucking to my
fixed headstock lathe by using drill press and Forstner bit. Is there a way to drill a reasonably concentric second mortise on the other side of the blank for reverse turning? Sorry for my confusing "Who's on first?" description. I mean with no more eccentricity than if I had turned the second mortise with the blank on the lathe chucked in the first mortise? I'm not saying that drilling concentric mortises while at the drill press is a better, or even a good way for reverse turning and I'm not concerned about the bowl's bottom. I just want to know if and how it can be done. I'm not even saying that turning bowls by reverse turning is the best way; especially with today's streamlined headstocks, spindle extenders and robust small extended chuck jaws. How many of you turn bowls without reversing the blank? How? Why? Why not? Perhaps a better question is When? Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#2
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Musing about single chucking vs reverse chucking.
Hi Arch
Should be easy Arch. Just some arbitrary sizes, OK, they can be changed to suit, and you might have to do some machining to get close fits. Drill a 1 1/4" hole in your blank, and set aside. Take a short piece of pipe that fits your 1 1/4" hole in your blank and is long enough to be clamped in your X/Y drill table vise, and stick out above it.(can be done in other vise also) Now make a arbor that will fit inside the pipe on one side, and turn down to fit into drill chuck on the other end. (make the arbor long enough to overcome the distance difference between thickness of the blank and the drills quill travel ability) Next put the arbor in the drill chuck and maneuver the pipe in the drill vise until the arbor goes straight into the pipe, clamp all down. Take the arbor out of the drill chuck and replace with the drill to be used, place blank on the pipe in the drill vise and drill your other mortice. Do I do it this way ??,.... NO. , works better on my late IMO. And never say never, I find turning a bowl in one setup akward, harder to get a good form and cutting against the grain make for a worse surface, then there will be this time ................ like I said !!! Have fun and take care Leo Van Der Loo |
#3
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Musing about single chucking vs reverse chucking.
"Arch" wrote: (clip) I just want to know if and how it can be done. (clip) ^^^^^^^^^^^^^^^ Arch, you're being Leo'd to death here. Here's how I would do it. After drilling one side of your blank, secure a flat board to the drill press bed, and drill a hole in it also. Go to the lathe and turn a "dowel" that is a snug fit in the drilled hole. Insert in the hole in the board on the drill press, slip the hole in the blank over the exposed end of the "dowel," and drill into the other side of the blank. |
#4
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Musing about single chucking vs reverse chucking.
Leo Lichtman wrote:
"Arch" wrote: (clip) I just want to know if and how it can be done. (clip) ^^^^^^^^^^^^^^^ Arch, you're being Leo'd to death here. Here's how I would do it. After drilling one side of your blank, secure a flat board to the drill press bed, and drill a hole in it also. Go to the lathe and turn a "dowel" that is a snug fit in the drilled hole. Insert in the hole in the board on the drill press, slip the hole in the blank over the exposed end of the "dowel," and drill into the other side of the blank. This was my thinking too, until I thought some more. The problem I see with this is that it assumes two things: 1- the original blank has two perfectly planed faces that are parallel planes. 2- the blank mounts perfectly on the first drilled hole. Forstner bits don't create a flat surface at the bottom of the hole. They are slightly convex, the opposite of what we want for an accurate grip. Now, I am not sure why Arch wanted to do this in the first place, but if you can solve these two problems it might work, though I don't see the point. As for Arch's second question, "How many of you turn bowls without reversing the blank?"... "Why? Perhaps a better question is When?" - I would only consider doing this if I was turning a very thin walled vessel where any inaccuracy in the second mounting would result in a rim / wall thickness which is noticeably uneven. "How?" I generally do this on a faceplate or chuck with large jaws to hold a tenon "Why not?" Because cutting the outside of the bowl with the grain is tricky. It can be done with a pulling cut and a gouge with a swept back edge. Or with special tools. Melvyn Firmager uses his nibby gouge for cutting against the grain and tidies up using a fresh burr on the long curved edge of his thin parting tool. So, it can be done, buts it's not by chosen approach. -- Derek Andrews, woodturner http://www.seafoamwoodturning.com http://chipshop.blogspot.com - a blog for my customers http://www.seafoamwoodturning.com/TheToolrest/ - a blog for woodturners |
#5
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Musing about single chucking vs reverse chucking.
Arch
I am not sure how I would drill the holes, but I would generally not bother so I am not much help. On the other hand I usually rough turn between centers, including the hollowing. For the final turning I use a glue block and finish turn from one fitting. It just seems easier to me and I do not have to worry about concentricity when remounting. -- God bless and safe turning Darrell Feltmate Truro, NS Canada www.aroundthewoods.com |
#6
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Musing about single chucking vs reverse chucking.
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#7
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Musing about single chucking vs reverse chucking.
Hi Leo, I was hoping for a really simple and easier method. I had
thought about attaching a spring center (like a Steb center) in line with the drill's bit to seat in the indent made by the bit's tip in the first mortise. This should center the 'other side' over the drill bit, but with rough surfaces to sit on this wouldn't assure concentric mortise walls and bottoms. I could seat the blank in my scroll chuck to avoid the rough surfaces, but then I have to center the blind 'other side' and I'm back to your method or one more complicated? I know I've forgotten something, but isn't there an easier way with common sense, lasers and such? Comments & other hole finding methods requested, laughter & derision acceptable if accompanied by a helpful adult. Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#8
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Musing about single chucking vs reverse chucking.
OK Arch
Simpler way, take drill press, position horizontally, call it lathe, clamp drill bit in lathe, hold blank and drill hole for woodworm screw, clamp woodworm screw and screw blank, drill or make the hole on the other side, DONE GG Have fun and take care Leo Van Der Loo |
#9
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Musing about single chucking vs reverse chucking.
I think I understand what you are asking. First, you drill a mortice on
the top of the bowl blank. This is to secure the blank to the lathe with a chuck while you turn the outside of the bowl. This eliminates the need for a faceplate. You want a second mortice on the bottom to reverse it and then turn out the inside of the bowl. This is my standard method of bowl turning. For the mortice on the bottom, I mark with calipers (which are super glued in place) a circle that is the same size as my chuck jaws. I use a dovetail scraper to cut a mortice.The angle of the dovetail matches that of my chuck jaws. You just line up the scraper with the ways of your bed, and the angles will match.Remove everything inside the line, then for the last cut, make the mortice just a hair bigger than the line. The plunge cut used isn't plunge, and then move it over to match the dove tail, but plunge at the angle of the dove tail. At the bottom of the last cut, let the scraper rest there for a moment or 2, just barely touching. This will remove almost all uneveness, so that when you reverse it, it will run true. This will get you an almost perfectly centered mortice every time. I think that it would be impossible with a forstner bit. If I am trying to turn very thin, then sometimes the outside will need to be trued up. For utility bowls, there isn't enough difference to worry about, especially if you green turn to final thickness like I do. You can also clean up the mortice with a small spindle gouge, sand it and call it finished if you want. If you are coring, you just leave the chuck on, and never have to recenter anything. Also when I am coring, I will dovetail the top mortice when I reverse the bowl the first time, because it holds a lot better than straight walls with angled jaws. robo hippy |
#10
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Musing about single chucking vs reverse chucking.
"robo hippy" wrote in message oups.com... For the mortice on the bottom, I mark with calipers (which are super glued in place) a circle that is the same size as my chuck jaws. I use a dovetail scraper to cut a mortice. If you have one of those two-fanged thin parting tools, you can cut pretty well into the bottom. I even angle mine in anticipation of the final tail. Nice for those fuzzy woods like aspen or willow that don't respond well to the pointed gouge smoothing and undercutting. The fangs do a reasonable cut. Nice thing about dovetails, unless you go dumb and leave fuzz sticking out or sawdust packed in, they'll get a piece as true as your chuck. Trick is to remember that, and if it doesn't mount perfectly, loosen and find out what's in the way. Even I sometimes just tighten instead of doing it properly. |
#11
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Musing about single chucking vs reverse chucking.
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#13
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Musing about single chucking vs reverse chucking.
Mac, I was looking for a way to drill both with the drill press one
after the other. A. Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#14
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Musing about single chucking vs reverse chucking.
"Arch" skrev i melding ... Sometimes I drill a mortise in a blank for expansion chucking to my fixed headstock lathe by using drill press and Forstner bit. Is there a way to drill a reasonably concentric second mortise on the other side of the blank for reverse turning? I reverseturn all my bowls and platters, every day. The forstner bit only makes the first recess. I mount the piece, rough turn the bottom shape as far as to flattening the bottom surface, then I use my parting tool to cut the opposite recess the same size as the first. It turns out exactly parallell and exactly centered, for all the natural reasons. BjarteR |
#15
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Musing about single chucking vs reverse chucking.
While all of you are trying to solve the multiple chuckig problem, what
everyone is actually suggesting is multiple chucking to drill two holes. It doesn't matter that you do it on the lathe or a drill press, but the end-for-end work is exactly that. Just turn the ends as needed for a given chuck and reverse when needed. All that work with dowels and jigs kind of defeats the advantages, don't you think? Joe Fleming - San Diego |
#16
Posted to rec.crafts.woodturning
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Musing about single chucking vs reverse chucking.
While all of you are trying to solve the multiple chuckig problem, what
everyone is actually suggesting is multiple chucking to drill two holes. It doesn't matter that you do it on the lathe or a drill press, but the end-for-end work is exactly that. Just turn the ends as needed for a given chuck and reverse when needed. All that work with dowels and jigs kind of defeats the advantages, don't you think? Joe Fleming - San Diego |
#17
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Musing about single chucking vs reverse chucking.
Arch wrote:
Mac, I was looking for a way to drill both with the drill press one after the other. A. I'm still wondering why? Further to my previous post regarding the wood having to have two parallel surfaces, another requirement is that the drill table be set absolutely perpendicular to the bit. Ultimately this problem boils down to drilling the second hole not only in the right place, but also along the same axis as the first hole was made. Small errors in setup are going to compound and make this approach very difficult to pull off. -- Derek Andrews, woodturner http://www.seafoamwoodturning.com http://chipshop.blogspot.com - a blog for my customers http://www.seafoamwoodturning.com/TheToolrest/ - a blog for woodturners |
#18
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Musing about single chucking vs reverse chucking.
Thanks Derek and all respondents, Yep, the axis is the problem and of
course you and the others who saw no reason for considering an inherently bad method are right. I hope thinking about problems, good or bad, interests a few of the group, otherwise my musings are nothing but trolls. Could be, I reckon. I am surprised that somebody didn't invoke the bylaws, since my question didn't advance the craft. Maybe just because I wanted to know if it could be done easily. Maybe because: it's there, the impossible dream, ours not to reason why, the cutting edge, did it my way, followers can never lead, a better day is coming, the new science, the poor intelligence, the plagiary proof technique... Truth is, because I wasn't sure it couldn't work. To coin a phrase, "perversus ego sum" or in English, I am a COC. Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#19
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Musing about single chucking vs reverse chucking.
On Sun, 23 Apr 2006 23:09:50 +0200, "Bjarte Runderheim"
wrote: "Arch" skrev i melding ... Sometimes I drill a mortise in a blank for expansion chucking to my fixed headstock lathe by using drill press and Forstner bit. Is there a way to drill a reasonably concentric second mortise on the other side of the blank for reverse turning? I reverseturn all my bowls and platters, every day. The forstner bit only makes the first recess. I mount the piece, rough turn the bottom shape as far as to flattening the bottom surface, then I use my parting tool to cut the opposite recess the same size as the first. It turns out exactly parallell and exactly centered, for all the natural reasons. BjarteR That's what most of us do, Bjarte.... but this is ARCH asking.. *lol* Mac https://home.comcast.net/~mac.davis https://home.comcast.net/~mac.davis/wood_stuff.htm |
#20
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Musing about single chucking vs reverse chucking.
Arch wrote:
I hope thinking about problems, good or bad, interests a few of the group, otherwise my musings are nothing but trolls. It is always a good idea to rethink old habits and ask why we do them and if they are still the best way. invoke the bylaws, since my question didn't advance the craft. Hardly. It may have given us all a new insight into the geometry of chucking wood. Just because I shot the idea down in flames doesn't mean that I had ever considered this approach before. Now that I have I am sure it is not going to work for me, but maybe someone will find a way to make it work I'm afraid I don't know the Latin for 'there is no such thing as a stupid question' -- Derek Andrews, woodturner http://www.seafoamwoodturning.com http://chipshop.blogspot.com - a blog for my customers http://www.seafoamwoodturning.com/TheToolrest/ - a blog for woodturners |
#21
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Musing about single chucking vs reverse chucking.
Thanks Derek & Mac, Don't encourage me! I'm thinking of asking your
help in turning a 'Penrose Triangle' next, since all my parallel tool marks cross each other. Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#22
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Musing about single chucking vs reverse chucking.
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#23
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Musing about single chucking vs reverse chucking.
Owen Lowe wrote:
In article , (Arch) wrote: the axis is the problem not by my method: Take a small-ish drill and bore the whole way through the blank. Then use that bore as a guide to center the Forstner on both sides. Hmmm? Nope. Centering is only part of the problem. You still have to align the axis of the forstner bits with the axis of the pilot hole. Any way, I doubt that a bowl with a hole in it would meet Arch's exacting standards. -- Derek Andrews, woodturner http://www.seafoamwoodturning.com http://chipshop.blogspot.com - a blog for my customers http://www.seafoamwoodturning.com/TheToolrest/ - a blog for woodturners |
#24
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Musing about single chucking vs reverse chucking.
In article ,
Derek Andrews wrote: Centering is only part of the problem. You still have to align the axis of the forstner bits with the axis of the pilot hole. OK, have a Forstner made with a very long center point that matches the through-hole that was drilled initially - then the through-hole is guiding the Forstner on the same axis...? Any way, I doubt that a bowl with a hole in it would meet Arch's exacting standards. Arch said in his initial message, "I'm not concerned about the bowl's bottom." He could then either plug it or leave it open. -- Owen Lowe Northwest Woodturners Pacific Northwest Woodturning Guild ___ Tips fer Turnin': Place a sign, easily seen as you switch on your lathe, warning you to remove any and all rings from your fingers. Called degloving, extended hardware can grab your ring and rip it off your finger. A pic for the strong of stomach: www.itim.nsw.gov.au/go/objectid/2A3AC703-1321-1C29-70B067DC88E16BFC/index.cfm Besides, rings can easily mar the surface of a turning as you check for finished smoothness. |
#25
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Musing about single chucking vs reverse chucking.
Owen, sometimes I feel like the world is passing me by. I thought I was
pretty arty when I stopped plugging faceplate screw holes with match stems, but when did felt and baize bowl bottoms go out of style? Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#26
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Musing about single chucking vs reverse chucking.
Hi Owen
ROFL when I read your first post, thought that a nice complimentary color plug would make for a pleasing total. :- Heck Arch could put in some more and have it look like a NIP bowl. :-))) Have fun and take care Leo Van Der Loo |
#27
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Musing about single chucking vs reverse chucking.
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#28
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Musing about single chucking vs reverse chucking.
Owen Lowe wrote:
Centering is only part of the problem. You still have to align the axis of the forstner bits with the axis of the pilot hole. OK, have a Forstner made with a very long center point that matches the through-hole that was drilled initially - then the through-hole is guiding the Forstner on the same axis...? That might work, but the pilot would have to be large enough diameter to prevent flexing. It's starting to sound more like a colander than a bowl -- Derek Andrews, woodturner http://www.seafoamwoodturning.com http://chipshop.blogspot.com - a blog for my customers http://www.seafoamwoodturning.com/TheToolrest/ - a blog for woodturners |
#29
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Musing about single chucking vs reverse chucking.
Arch wrote:
Owen, sometimes I feel like the world is passing me by. I thought I was pretty arty when I stopped plugging faceplate screw holes with match stems, but when did felt and baize bowl bottoms go out of style? Owen's latest suggestion would require felt on the outside and inside of the bowl. How does that satisfy your aesthetics? -- Derek Andrews, woodturner http://www.seafoamwoodturning.com http://chipshop.blogspot.com - a blog for my customers http://www.seafoamwoodturning.com/TheToolrest/ - a blog for woodturners |
#30
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Musing about single chucking vs reverse chucking.
On Mon, 24 Apr 2006 11:12:37 -0400, (Arch) wrote:
snip I am surprised that somebody didn't invoke the bylaws, since my question didn't advance the craft. snip Some rules are made to be broken, Arch... *g* IMHO, the term "advance the craft" just has an elitist ring to it.... I thought we were here to talk about our common interest in spinning wood and aiming a sharp object at it, help others that have questions and have some fun.... Mac https://home.comcast.net/~mac.davis https://home.comcast.net/~mac.davis/wood_stuff.htm |
#31
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Musing about single chucking vs reverse chucking.
On Mon, 24 Apr 2006 16:12:48 -0700, Owen Lowe wrote:
In article , (Arch) wrote: the axis is the problem not by my method: Take a small-ish drill and bore the whole way through the blank. Then use that bore as a guide to center the Forstner on both sides. Hmmm? I think a small bore round like the 22 magnum might be faster and more accurate, Owen.. Easier to get dowels in that size, too... at least on the entry side.. *g* Personally, I think that Arch should work on a system that holds the wood in place while the drill press and lathe revolve around it.. drilling accurate holes on both sides at once.... Mac https://home.comcast.net/~mac.davis https://home.comcast.net/~mac.davis/wood_stuff.htm |
#32
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Musing about single chucking vs reverse chucking.
On 24 Apr 2006 22:44:20 -0700, "
wrote: He Arch I still have a couple of those "felt over screwhole bowls", no baize on them anymore though, the glue gave out :-)) Maybe they went out of style when felt got to expensive, or maybe it didn't stick to PEG, biggest problem was maybe color coordination, that green color just didn't make the grade. After whittling plugs from twigs and have them fall out when dried, I tried some of that rocker cover packing cork, didn't go over to well either. So much for the good old day's Have fun and take care Leo Van Der Loo My brother used to drill the screw holes BIGGER and glue little turned pegs in them for "legs"... lol Mac https://home.comcast.net/~mac.davis https://home.comcast.net/~mac.davis/wood_stuff.htm |
#33
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Musing about single chucking vs reverse chucking.
On Tue, 25 Apr 2006 10:54:09 GMT, Derek Andrews
wrote: Arch wrote: Owen, sometimes I feel like the world is passing me by. I thought I was pretty arty when I stopped plugging faceplate screw holes with match stems, but when did felt and baize bowl bottoms go out of style? Owen's latest suggestion would require felt on the outside and inside of the bowl. How does that satisfy your aesthetics? Maybe cork on the bottom and flocking inside? *lol* Mac https://home.comcast.net/~mac.davis https://home.comcast.net/~mac.davis/wood_stuff.htm |
#34
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Musing about single chucking vs reverse chucking.
In article ,
mac davis wrote: Personally, I think that Arch should work on a system that holds the wood in place while the drill press and lathe revolve around it.. drilling accurate holes on both sides at once.... Well, there you go!!! Have a two-head drill press (or use a lathe-type setup with one bit in the headstock and the other in the tailstock) with the bits aligned opposite each other - cutting edge to cutting edge. Clamp the wood between the heads and then drill into the blank from both sides. -- Owen Lowe Northwest Woodturners Pacific Northwest Woodturning Guild ___ Tips fer Turnin': Place a sign, easily seen as you switch on your lathe, warning you to remove any and all rings from your fingers. Called degloving, extended hardware can grab your ring and rip it off your finger. A pic for the strong of stomach: www.itim.nsw.gov.au/go/objectid/2A3AC703-1321-1C29-70B067DC88E16BFC/index.cfm Besides, rings can easily mar the surface of a turning as you check for finished smoothness. |
#35
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Musing about single chucking vs reverse chucking.
Stop it Owen! I just got a flyer advertising a sale on super long point
Forstner bits this morning. Keep this up and they'll be putting out a special edition catalog. Mac, Ain't it enough that my lathe walks around the shop. Now you want me to teach it how to do cartwheels! Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings |
#36
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Musing about single chucking vs reverse chucking.
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#37
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Musing about single chucking vs reverse chucking.
On Tue, 25 Apr 2006 13:38:41 -0400, (Arch) wrote:
Stop it Owen! I just got a flyer advertising a sale on super long point Forstner bits this morning. Keep this up and they'll be putting out a special edition catalog. Mac, Ain't it enough that my lathe walks around the shop. Now you want me to teach it how to do cartwheels! Turn to Safety, Arch Fortiter http://community.webtv.net/almcc/MacsMusings no cartwheels, Arch... just barrel rolls.. *g* Mac https://home.comcast.net/~mac.davis https://home.comcast.net/~mac.davis/wood_stuff.htm |
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