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Karl Gallagher Full Member Offline WR Rocks! Posts: 65 Gender:	10% Cobalt HSS 08/07/12 at 13:28:03 Anyone know where I could get a couple of these suitable for making homemade hollowing tools. I have already sourced the drill-rod, or what we call silver steel on this side of the pond. I had been searching for drill rod but was told its the same as silver steel.
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Jeff Vanden Boogart WR Supporter Offline WR Rocks! Posts: 361 Gender:	Re: 10% Cobalt HSS Reply #1 - 08/07/12 at 13:52:36 I believe ENCO has cobalt tool bits
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Karl Gallagher Full Member Offline WR Rocks! Posts: 65 Gender:	Re: 10% Cobalt HSS Reply #2 - 08/07/12 at 14:02:21 Thanks Jeff. I think I looked there before but wasn't sure what to look for or where to find it.
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Ken Vaughan

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Re: 10% Cobalt HSS
Reply #3 - 08/07/12 at 18:26:16

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My experience is that you will pay more for the cobalt than M2 high speed steel but not gain any particular performance. The cobalt handles the higher heat associated with some tough stuff like cast iron, ductile iron etc.

Silver Steel and Drill Rod are both high carbon steel. Oil hardening and water hardening are the most common.

Drill Blanks are generally round high speed steel rods -- think hss drill bit before grinding.

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« Last Edit: 08/07/12 at 18:26:46 by Ken Vaughan »

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Mauricio Kolenc Full Member Offline Posts: 84 Gender:	Re: 10% Cobalt HSS Reply #4 - 08/11/12 at 10:20:46 I buy the 10% co bits in a store that sells metalturning supplies. For the rods I use 1020 steel .(silversteel is also available here but i`ve never tried it) Ellsworth tools are the best and cheapest hollowing tools ,I only use them for hollowing .
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Karl Gallagher

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Re: 10% Cobalt HSS
Reply #5 - 08/11/12 at 13:03:57

Mauricio Kolenc wrote on 08/11/12 at 10:20:46:

I buy the 10% co bits in a store that sells metalturning supplies.
For the rods I use 1020 steel .(silversteel is also available here but i`ve never tried it)
Ellsworth tools are the best and cheapest hollowing tools ,I only use them for hollowing .

Hi Mauricio. It was your sphere shaped forms on your Facebook page that got me hooked. I meant to send you a message through facebook to see if you had photos of your homemade hollowing tools. I've just gotten two 2 metre lengths of 5/8" silver steel for the shafts of the tools.

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Donal Cleary Full Member Offline WR Clocks! Posts: 98	Re: 10% Cobalt HSS Reply #6 - 08/11/12 at 13:21:00 Mabye you could try HSS tool blanks that metal turners use, could be less hassle mabye? more widely available.
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Karl Gallagher Full Member Offline WR Rocks! Posts: 65 Gender:	Re: 10% Cobalt HSS Reply #7 - 08/11/12 at 13:42:53 Looks like that's all that's available here in Ireland.
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Ken Vaughan WR Moderator Offline Still learning Posts: 2168 Gender:	Re: 10% Cobalt HSS Reply #8 - 08/11/12 at 15:18:21 Gentlemen -- look for a firm that supplies machinists. All of these inserts are common stock for any machinist doing metal lathe work. If you cannot find anything local -- I will mail you a few pieces of 1/4 (6mm) M2 High Speed Steel -- I have no shortage. I may have some cobalt steel, but expect most is M2. PM me with a mail address
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Mauricio Kolenc

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Re: 10% Cobalt HSS
Reply #9 - 08/12/12 at 06:35:20

The thicker rods I use are 1/2 but thicker ones may be needed for bigger forms.
The 10 % Co Hss square bits are 1/4 for straight tools and 3/16 for bent ones.
I recomend you read Ellsworth book on hollow forms.
If you wish I make a longer explanation on how I make mine.
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; Here you can see them .

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Ken Vaughan WR Moderator Offline Still learning Posts: 2168 Gender:	Re: 10% Cobalt HSS Reply #10 - 08/12/12 at 07:34:11 For those who want a quick read on Ellsworth hollowing Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to or or short URL format Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to or
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Karl Gallagher Full Member Offline WR Rocks! Posts: 65 Gender:	Re: 10% Cobalt HSS Reply #11 - 08/12/12 at 13:31:26 Great read. Thanks for the link Ken.
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