Wire Gauge Drills

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Wire Gauge Drills

This topic has 10 replies, 5 voices, and was last updated 2 April 2021 at 22:59 by Bazyle.

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2 April 2021 at 14:35 #537639
Brian H
Participant
@brianh50089
Can someone tell me what standard wire gauge drill are made to? I'm sure that it''s not SWG.

Also, where can I buy straight lengths of wire to the same gauge?

Brian
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2 April 2021 at 14:35 #20229
Brian H
Participant
@brianh50089
2 April 2021 at 14:56 #537645
Michael Gilligan
Participant
@michaelgilligan61133
Why are you sure of that, Brian ?

So far as I am aware SWG means SWG

MichaelG.

.

Edit: Not to be confused with AWG or any minority series

Edited By Michael Gilligan on 02/04/2021 14:57:16
2 April 2021 at 15:07 #537648
Russell Eberhardt
Participant
@russelleberhardt48058
I believe they were originally based on Stubs steel wire gauge, not to be confused with Stubs iron wire gauge!

Russell
2 April 2021 at 15:09 #537649
Brian H
Participant
@brianh50089
Thanks Michael, I compared the drill sizes with a SWG chart and it didn't seem to match, mind you, I only checked a few sizes.

Brian
2 April 2021 at 15:10 #537650
Howard Lewis
Participant
@howardlewis46836
Possibly wrongly, my inclination would be to look up the diameter of the particular SWG and then find a small number drill of that size.

As an example: 20 SWG is 0.022"diameter, 0.58 mm, which is a No 74 drill, according to my Metric Revision Zeus charts.

HTH

Howard
2 April 2021 at 15:18 #537652
Michael Gilligan
Participant
@michaelgilligan61133
Is this any help ?

**LINK**

https://marston-sunbeam.org/threads/combined_swg_nodrill_letterdrill.php

MichaelG.

.

My usual ‘aide memoire’ for spot-checking any table which includes wire gauges is

16 SWG = 0.064” or 1.626mm [as near as matters for the purpose]

Edited By Michael Gilligan on 02/04/2021 15:26:08
2 April 2021 at 18:15 #537692
Brian H
Participant
@brianh50089
Many thanks for the link Michael, that's one of the best I've seen.

I believe that Russell hit the nail on the head, a little bit of research shows that it is indeed Stubs Steel wire Gauge.

The only problem is that I have been unable to find a supplier of straight lengths so have decided to remake the valve guides with an accurate 1/16" bore as I have found 2 pieces of 1/16" silver steel in my silver steel box.

I did try to make a pair of valve stems from drills but they are hard all the way up the shanks and don't seem amenable to annealing,

Brian

Edited By Brian H on 02/04/2021 18:18:19
2 April 2021 at 19:05 #537703
Michael Gilligan
Participant
@michaelgilligan61133
Good ol’ Wikipedia gives us this useful comparison chart: **LINK**

https://upload.wikimedia.org/wikipedia/commons/2/28/Gauge_Chart.pdf

MichaelG.
2 April 2021 at 22:32 #537732
Brian H
Participant
@brianh50089
Many thanks for that link Michael, it is very comprehensive.

Brian
2 April 2021 at 22:59 #537738
Bazyle
Participant
@bazyle
One of the techniques in this stuation is to find the wire you want to use and make a D-bit out of it to ream the hole you drill just below size.
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