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4.70mm #12 G Silver Steel

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Roger Woollett30/06/2022 16:55:16
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Drill Service also have 4.70mm drill blanks. 89mm long and £2.28 + VAT

JasonB30/06/2022 16:57:08
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If the 4.7mm stock is going to be shaped like some of the available staking tools would HSS drill blanks be a bit more difficult to work than silver steel which can easily be machined before hardening. HSS would really need grinding.

 

Edited By JasonB on 30/06/2022 17:04:11

Peter Cook 630/06/2022 17:28:25
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Thank you for the idea. Drill blanks are something I did not know you could buy - filed for future use. However as Jason says, shaping HSS drill blanks (drilling holes in them and shaping them) may be more work than thinning down a bit of silver steel.

I am also not too sure about using HSS as a punch given my ability to chip the edges of HSS lathe tools!

A cheaper source of material may be to buy some old punches off Ebay and anneal and reshape the tips

Thanks again.

Michael Gilligan30/06/2022 18:49:31
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Posted by JasonB on 30/06/2022 16:57:08:

If the 4.7mm stock is going to be shaped like some of the available staking tools would HSS drill blanks be a bit more difficult to work than silver steel which can easily be machined before hardening. HSS would really need grinding.

.

The information seems difficult to locate on the U.K. site … but this supports my understanding:

**LINK**

https://www.metalsupermarkets.com/what-is-drill-rod/

MichaelG.

JasonB30/06/2022 19:33:36
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Michael the suggestions were to use DRILL BLANKS not drill rod, the latter is what they call Silver steel in the US and is just a carbon steel with ground finish. Drill blanks are blank drills available in HSS or Carbide

HSS ones are hardened and ground all over not even soft shanked like a drill bit

Edited By JasonB on 30/06/2022 19:39:12

Michael Gilligan30/06/2022 20:20:48
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O.K. that’s fine … I’ve learned something

Thank you

MichaelG.

.

Doesn’t get any easier though … when this is a direct quote from the Cromwell site:

”Besides this, drill blanks can be forged into custom tools or bits on and can be modified to create drills or punches that are specialised to any task, via the use of a lathe or another suitable machine.”

Ref. __ https://www.cromwell.co.uk/shop/cutting-tools/drill-blanks/c/391501

 

Edited By Michael Gilligan on 30/06/2022 20:30:05

JasonB30/06/2022 20:26:40
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Interesting that a No 13 drill is 0.185" which is 4.7mm well 1 micron under to be exact.

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