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Old 03-14-2018, 04:36 PM
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Default Metal Scribe

Had a some time today, so made a metal scribe. Turned out as I had hoped. First time using doing knurling. Did not want a deep knurl, just enough to keep the scribe from slipping in my hand. Made from a piece of 1/2" round bar. Used a 3/32" tungsten for the point. Locked it in with a dab of silicone so it can be removed if it gets broken. Point is 1" long. Decided not to make a removable cap, since I am making 4 of them, so I have one at the lathe and each drill press.
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Old 03-14-2018, 04:58 PM
Lew Hartswick Lew Hartswick is offline
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You may want to grind the taper longer to make it easier to scribe along a straight edge. With that angle you'll have to hold it over pretty far for the point to be against the edge.
...lew..
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Old 03-14-2018, 05:33 PM
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Perfect!!!!!!!
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Old 03-14-2018, 06:29 PM
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Quote:
Originally Posted by Lew Hartswick View Post
You may want to grind the taper longer to make it easier to scribe along a straight edge. With that angle you'll have to hold it over pretty far for the point to be against the edge.
...lew..
Tungsten is fairly fragile for side pressure so kept the angle as blunt as I could. I did a practice scribe and it seemed to work OK.

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Perfect!!!!!!!
Thanks. Now to make the rest of them. I am going to try some 3/8" round stock for the next one. I really need to make a follower to do the knurling though.
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Old 03-14-2018, 06:48 PM
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The wife bought me one of these
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Old 03-14-2018, 07:07 PM
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Just a note, for heavy knurling, I was always told to take the live centre out of the tailstock and use a dead centre instead.

The idea is it’s a little easier than side loading the bearings.


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Old 03-14-2018, 07:45 PM
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I don't think that a follower would work, it would smuch uo your knurl on the way by.
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Old 03-14-2018, 10:34 PM
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A follow rest can work, but you set it up so it’s not ‘following’ but just ahead of the knurl. Some lathes you can adjust the compound enough to do that, some not so easy.

Been a long time since I’ve used a follow rest. Not sure if I have one for my old South Bend or not.


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Old 03-14-2018, 10:42 PM
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Originally Posted by greywynd View Post
A follow rest can work, but you set it up so it’s not ‘following’ but just ahead of the knurl. Some lathes you can adjust the compound enough to do that, some not so easy.

Been a long time since I’ve used a follow rest. Not sure if I have one for my old South Bend or not.


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That is what I was thinking. But remember, I have no real experience with knurling except for the one scribe I did.
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Old 03-14-2018, 10:57 PM
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Quote:
Metal Scribe

Had a some time today, so made a metal scribe. Turned out as I had hoped. First time using doing knurling. Did not want a deep knurl, just enough to keep the scribe from slipping in my hand. Made from a piece of 1/2" round bar. Used a 3/32" tungsten for the point. Locked it in with a dab of silicone so it can be removed if it gets broken. Point is 1" long. Decided not to make a removable cap, since I am making 4 of them, so I have one at the lathe and each drill press.
Chris
Nice job on the scribe....looks sharp


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The wife bought me one of these
digr...... I wish my wife would buy me anything in the realm of tools
but if she did i'd have a heart attack LOL!

Anyway... I just picked up one of them my self it's a bit used but still in good shape..... now I just need to learn how to use it.....
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