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Thread: Small Marking Gauge
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16th February 2019, 04:35 PM #1
Small Marking Gauge
Here's a marking gauge I made from some mahogany scrap (if there is such a thing ).
I didn't want to spoil it with metal or plastic thumbscrews and I don't have the means to cut wooden threads so I decided on a wedge system to lock the shaft. First job was to cut the mortises for the shaft and wedgeIMG_1713.jpghead blank.jpg
This was done by hogging out the bulk of the wood with appropriately sized drills and then refining using chisels and small files. The tricky part is to get the correct 'interference' between the wedge and shaft mortises. I also left the bulk of the scrap in place so it was easier to hold in the vice while cutting the mortises.
Once that was done, I could shape the wedge and work on it until it passed through and locked the shaft.
Then I thought about the pin I would use as a marker.
I had a scriber from a broken adjustable square which seemed it would do the trick. It's made from very hard steel and obviously intended to scribe on metal. It had a knurled head with a thread under it which screwed into the body of the original square.IMG_1717.jpg
It was a simple matter to drill a shallow 4mm dia countersink which allowed the scriber to cut its own thread and secure the pin in place.
It works well with the grain but tends to tear cross grain so I will shape the tip to a knife style (if I can - it's hard steel) or replace it with something more malleable that can be shaped.
Lots of sanding through the grits then a quick wipe with linseed oil et voila.
IMG_1721(1).jpgIMG_1720.jpg
First time at making a tool
Cheers,
Pete
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16th February 2019, 07:04 PM #2
Nice work Pete.
There’s something very special about using a tool one as made them self.
Cheers Matt
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16th February 2019, 07:12 PM #3
Good effort for a first go!
All pin type marking gauges produce slight tear out when used across the grain, the key is to use several light strokes. But if the tool making bug has bitten then try making a knife type marking gauge to compliment your pin type!Nothing succeeds like a budgie without a beak.
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17th February 2019, 03:13 AM #4
Thanks for the likes and comments guys.
Actually I put you crook saying it was a first tool. I did, of course, make a leather strop posted a week or so ago. Sorry if I've offended the sharpening enthusiasts by not thinking of it as a tool
Chief Tiff, cheers, for the advice on knife style pins. What I will probably do is make a number of shafts to fit the head stock each with dual pins to suit various chisel widths and one with a knife edge.
Now that's a versatile tool!
Cheers,
Pete
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20th February 2019, 01:55 PM #5
Hi,
Good work on the gauge. The multiple shaft idea will be fine if you only use a gauge now and then but multiple gauges mean you can do a project without having to reset back and forth. Better get crackin and build some more.
Regards
John
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22nd February 2019, 09:52 AM #6
Good point, John. Still got some mahogany for the shafts but it will have to be contrasting wood for more head stocks. Still, that might be even better.
Pete
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22nd February 2019, 01:10 PM #7
I have found over the years that the collection has grown. Have 6 now and they all get used. 7 if you count the miter square. I do like that old French style one you made as squeezing a wedge is less fiddle than doing up a screw. I made a couple of those a few years back but with a round dowel wedge. Having one that takes a pencil is a handy addition to the collection too.
This link shows how the round dowel wedge is done.
https://www.highlandwoodworking.com/...ing-gauge.html
Regards
John
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