OldTools Archive
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268207 | Ken Wright <wizard@b...> | 2019‑03‑26 | Bit brace adapters |
Gentle galoots, I recently had occasion to bore two blind, flat-bottomed holes. Couldn't use an auger bit; the lead screw would have poked through. I ended up using a modern Forstner bit which I was able to hold in a brace, but I wasn't happy with the round shank in the two-jaw chuck. Does anybody know of an adapter for these round-shank bits? I see Lee Valley has one for hex-shank bits, but that's not what I need. Thanks in advance to anyone who can help! Ken -- Registered Linux user #483005 If you ever think international relations make sense, remember this: because a Serb shot an Austrian in Bosnia, Germany invaded Belgium. |
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268208 | Erik Levin | 2019‑03‑26 | Re: Bit brace adapters |
Ken Wright asked: > I wasn't happy with the round shank in the two-jaw chuck. > Does anybody know of an adapter for these round-shank bits? There may be other options, but the two that I have used are a file to square the shank so the jaws could hold better; and using a brace with a chuck intended for both conventional square-taper brace bits and for round bits (some Yankee chucks, for example, do a good job). I should imagine that new jaws could be made for many chucks to better hold round shank bits, though I have never had the urge, or that a butchered eggbeater or breast drill could have the chuck and spindle liberated and modified with a file for the purpose. Or that a butchered bit could have the tapered-square shank cut off and threaded for a modern thread-mound chuck. (PORCH PREFERRED SOLUTION) Or, use this as an excuse to get some Forstner bits with the proper shank. *** This message was sent from a convenience email service, and the reply address(es) may not match the originating address |
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268209 | John Ruth <johnrruth@h...> | 2019‑03‑26 | Re: Bit brace adapters |
Ken, There are Forstner-pattern bits with bitstock shanks to fit into a brace. ( I found my set, in their original factory wrappers, at the Stormville NY Flea Market about 30 years ago. ) Roy Underhill shows a bitstock-shank Forstner as a way to excavate the recess in a wooden box to hold a whetstone. Several makers currently offer Forstners with hexagon shanks, which most brace chucks will grip. Alternative: Start the hole with a hex-shank spade bit. Once the hole is established, continue boring with the same size spade bit with the center spur ground wholly or partly off. Another alternative would be to convert a Russell Jennings pattern bit into a sort of “blind footed” bit without a center lead screw and reduced spurs, again to be used in a hole established with a normal bit. [Yes, I do realize that that’s not exactly the definition of a blind-footed bit, which is an open helix with only one cutting edge.] A rare Cook’s pattern bit would be ideal for this, but don’t let any collectors catch ya butchering a Cook’s, as they are quite rare. John Ruth Who sees far too many auger bits that have been ruined by ignorant sharpening. |
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268210 | Bill Ghio | 2019‑03‑26 | Re: Bit brace adapters |
Traditionally you would use a center bit. You need to go into tool acquisition mode. Bill Sent from my iPad |
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268211 | Kirk Eppler | 2019‑03‑26 | Re: Bit brace adapters |
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268212 | "Adam R. Maxwell via OldTools" <oldtools@s...> | 2019‑03‑26 | Re: Bit brace adapters |
> On Mar 25, 2019, at 17:16 , Ken Wright |
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268213 | Kirk Eppler | 2019‑03‑26 | Re: Bit brace adapters |
Here is mine, middle left, it may be a GP too. Mine may only be a 1/4", won't get to look for a day or two. https://kirkhmb.smugmug.com/Woodworking/Woodworking-Tools/i-WnKPP5S Kirk in HMB, CA |
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268214 | Don Schwartz <dks@t...> | 2019‑03‑26 | Re: Bit brace adapters |
On 2019-03-25 7:02 p.m., Erik Levin via OldTools wrote: > (PORCH PREFERRED SOLUTION) Or, use this as an excuse to get some Forstner bits with the proper shank. Or a brace that will hold the bits you own - Samson et al. OR both! Don -- “Nature does not care for your opinion.” Robin Coope A thermometer is not liberal or conservative. - Katharine Hayhoe Of all the tyrannies that affect mankind, tyranny in religion is the worst. Thomas Paine Being offended doesn't make you right. |
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268216 | Ed Minch <ruby1638@a...> | 2019‑03‑26 | Re: Bit brace adapters |
If you have the proper assortment of braces, there will be a couple in there that will hold a round shank. If the bit is big I have had trouble tightening the chuck enough to hold it and had to resort to the channel lock-with-leather- piece to make it work. Ed |
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268217 | John Ruth <johnrruth@h...> | 2019‑03‑26 | Re: Bit brace adapters |
Ed, (Snipped as per FAQ) “If the bit is big I have had trouble tightening the chuck enough to hold it and had to resort to the channel lock-with-leather-piece to make it work.” To borrow a phrase recently used by Erik the Porch Preferred Solution is to use this as an occasion to buy another tool! https://www.amazon.com/Crescent-52910N-Connector-Pliers-10-Inch/dp/B001 70RES8/ref=asc_df_B00170RES8/?tag=bingshoppinga-20&linkCode=df0&hvadid=%7Bcreati ve%7D&hvpos=%7Badposition%7D&hvnetw=o&hvrand=%7Brandom%7D&hvpone=&hvptwo=&hvqmt= e&hvdev=m&hvdvcmdl=%7Bdevicemodel%7D&hvlocint=&hvlocphy=&hvtargid=pla-4583863979 854798&psc=1">https://www.amazon.com/Crescent-52910N-Connector-Pliers-10-Inch/dp /B00170RES8/ref=asc_df_B00170RES8/?tag=bingshoppinga-20&linkCode=df0&hvadid=%7Bc reative%7D&hvpos=%7Badposition%7D&hvnetw=o&hvrand=%7Brandom%7D&hvpone=&hvptwo=&h vqmt=e&hvdev=m&hvdvcmdl=%7Bdevicemodel%7D&hvlocint=&hvlocphy=&hvtargid=pla-45838 63979854798&psc=1 Get a couple of sets of spare jaws, because they are fairly soft and therefore wear quickly. Amazing how many uses you’ll find for this tool! John Ruth |
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268218 | Ed Minch <ruby1638@a...> | 2019‑03‑26 | Re: Bit brace adapters |
> On Mar 26, 2019, at 8:58 AM, John Ruth |
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