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Thread: New marking gauges
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15th October 2021, 06:49 PM #31
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16th October 2021, 09:30 AM #32Try not to be late, but never be early.
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Ian, I'll be thinking about these bits for the rest of the day, and it's my own fault.
Cheers,
Geoff.
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16th October 2021, 11:09 AM #33
Serves yer roight.....
IW
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16th October 2021, 02:11 PM #34
Normal small sized auger bits can be converted into large miniature auger bits
Cut the square drive off and holding the bit in a chuck on the lathe you can either machine the shank down to a suitable size; if vibration is an issue rub a file against it whilst supporting the shank with a notched piece of wood. Then get some square key steel and hold it in a four jaw chuck to drill the hole for the shank. File the tapers on the key and solder the two parts together.
For a brace you don’t need a chuck; there were plenty of low-tech/low-cost versions made from bent bar that held the bit in a clamp. I have some excess M4 threaded thumbscrews in SS and brass from The Nuke that would suit admirably!Nothing succeeds like a budgie without a beak.
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16th October 2021, 07:23 PM #35
Chief, I've thought about 'miniaturising' regular bits too. Re-forming the shank would not be a problem along the lines you suggested, the steel of any bit I've struck is pretty soft & amenable to being turned & filed, but the flutes would need modifying (shortening) to keep them in proportion, which then requires the lead screw to be re-made - all do-able but a lotta work.
Now like Geoff, I've been thinking about it all day on & off. What I would really like is something like this: brace1.jpg
(image borrowed from 'Joel's blog' [thankyou Joel] )
There were several different types of chuck on these old wooden/metal braces, iirc, one I've seen being nothing much more complicated than a hole & a grubscrew. So I been thinkin', I've got a few old gimlet bits kicking about, which would suit the style, so I just might end up having a crack at slightly dumbed-down Ultimatum. I'm playing for high stakes with this project and a fancy little brass & wood brace just might be the ice-cream on my cake...
Thanks for the offer of thumb-screws (if that was an offer), but I have a goodly supply of all sorts of grub-screws, thumbscrews, etc. & what I don't have I can soon make - that's part of the fun! In fact I made these bits this morning, for the mini mortise gauge: parts.jpg
I glued the wear strip in the stock & the brass tip to the beam tonight, so it should be finished tomorrow.
The tool-chest is filling up...
Cheers,IW
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17th October 2021, 09:39 PM #36
Set complete
Orright - so a couple of days ago I got as far as making most of the bits for the mortise gauge I showed a few posts ago:
parts.jpg
Last night I glued the tip on the beam & the wear-strip in the stock, so it was all ready to finish this morning.
After sanding the brass tip flush with the beam, I set out the mortise for it in the stock. Its companion mini gauges came in mighty handy on such a small piece!
A1.jpg
I have a couple of very small gauges that I use a lot on small jobs, but they are almost clumsy compared with the minis.
Small & mini.jpg
I thought they were as small as could be useful, but the minis were much more at home working on this tiny stock. I also used the mini mortise chisel & bull-oak mallet, just to see how they'd go. In this case, not so great, the small chisels had my hands covering up the work, and the little mallet took a lot of taps to drive the chisel into the hard oak. So I pulled out a L-N (which are pretty small chisels anyway) and my regular mallet & that had the job done much more quickly & was definitely more comfortable!
A2.jpg
With the mortise cut out, I made & fitted the "shoe" that protects the beam from the thumbscrew, cleaned everything up, & Bob's your aunty:
A3.jpg
I added a feature I've not tried before. With this style of mortise gauge, most makers put the thumbscrew underneath so that it bears directly on the slider and locks it in position. I don't like that system because the thumbscrew catches on things in use and can be awkward. So I put the thumbscrew over the top of the beam & fit the slider very carefully so it stands just a little proud of the wood of the beam, so that when the TS is tightened, the slider is squeezed between the beam & the bottom of the mortise, locking it firmly. On my mini, I used a pretty thin piece of brass for the slider (1.6mm thick) and I made the groove for it a bit over-generous. Rather than sand the beam down to make the slider proud, I made an insert for the bottom of the stock so I could screw a 3mm grubscrew up til it just touches the slider. When the thumbscrew is tightened, it presses the slider against the end of the grubscrew & locks it very nicely. It works so well, I might have to do something similar to my big gauge:
A4.jpg
Here is the mini alongside a "standard" gauge:
A6.jpg
So the set is now "complete":
A5.jpg
Not the most practical everyday tools to be sure, but I think they have the "cute factor" I was aiming for.....
CheersIW
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