Author Topic: Truing diamond holder for TCG for surface grinding  (Read 791 times)

Offline PekkaNF

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Truing diamond holder for TCG for surface grinding
« on: January 29, 2019, 03:06:19 AM »
Need an idea how to true accurately grinding wheel on vintage TCG.

Immediate need is very simple holder that will be mounted on table T-slot or magnetic chuck.



Any pitfalls? Any advice?

Thank you,
Pekka

Offline awemawson

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Re: Truing diamond holder for TCG for surface grinding
« Reply #1 on: January 29, 2019, 06:45:37 AM »
Mine seems identical to the photo below that I found on ebay, but the ebay one is a stupid price and in the USA. I seem to remember mine came from Cromwell but it was literally 25 years ago  :bugeye:

Simple enough to make
« Last Edit: January 29, 2019, 12:08:48 PM by awemawson »
Andrew Mawson
East Sussex

Offline PekkaNF

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Re: Truing diamond holder for TCG for surface grinding
« Reply #2 on: January 29, 2019, 07:17:07 AM »
That looks simple enough. The thumb-screw it to turn the diamond and prevent one sided wear?

Pekka

Offline awemawson

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Re: Truing diamond holder for TCG for surface grinding
« Reply #3 on: January 29, 2019, 07:43:17 AM »
Well it just holds the shank of the diamond - I suppose being a thumb screw makes rotation easier. Before I had that gizmo I just had a block of steel with a suitable hole drilled in it, with a locking grub screw - I think it's still floating about in my grinding cupboard even after all those years  :med:
Andrew Mawson
East Sussex

Offline Alphawolf45

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Re: Truing diamond holder for TCG for surface grinding
« Reply #4 on: January 29, 2019, 10:58:13 AM »
  I use a simple diamond holder.. Must also have angle/radius dresser in your kit.. And recently a friend gave me a small piece of hard black stick -Crystolum? It is handy for hand shaping a wheel...Couple weeks ago I was stunned to see my 85 year old tool and diemaker buddy pick up a piece of steel wider than the grinding wheel and touched it lightly to the spinning wheel for a bit of trueing before final finish passes.. Not certain what that was about but I will try it myself.
I am not actually retired ,I merely find myself disabled by an intolerance for productive activity.

Offline PekkaNF

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Re: Truing diamond holder for TCG for surface grinding
« Reply #5 on: January 30, 2019, 03:26:50 PM »
  I use a simple diamond holder.. Must also have angle/radius dresser in your kit...

First step to true the wheel. Gobbled up this one.

Offline awemawson

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Re: Truing diamond holder for TCG for surface grinding
« Reply #6 on: January 30, 2019, 04:27:52 PM »
It'll do fine  :thumbup:

Andrew Mawson
East Sussex

Offline PekkaNF

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Re: Truing diamond holder for TCG for surface grinding
« Reply #7 on: February 10, 2019, 07:17:13 AM »
And it has worked - in several ocassions.

I was thinkking of "stocking up" few truing inserts and took a picture of the I have to assess the wear of it. Not much wear, clearly used, but still usable. However, it does not look like a "diamond". It was cheap, butt description said "diamond truing" etc.

No problem, because it seems to work on "blue" wheel.

BUT: Is there a prefered type of these or any ebayspecial will do?

Thank you

Offline awemawson

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Re: Truing diamond holder for TCG for surface grinding
« Reply #8 on: February 10, 2019, 08:13:45 AM »
If it's harder than the stone then it'll work. No need to use the Crown Jewels  :thumbup:
Andrew Mawson
East Sussex

Offline PekkaNF

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Re: Truing diamond holder for TCG for surface grinding
« Reply #9 on: February 10, 2019, 09:27:23 AM »
If it's harder than the stone then it'll work. No need to use the Crown Jewels  :thumbup:

Yea-but. No-but. :lol:

This is fine for this aluminium oxide - tested. But I have silicon oxide and harder wheels. Thinkking ahead - you know :)

Pekka

Offline WeldingRod

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Re: Truing diamond holder for TCG for surface grinding
« Reply #10 on: February 10, 2019, 04:05:01 PM »
The black diamonds are actually better for this than the clear ones.

Kind of hard to tell what the element is.  If it looks natural, you've got a real diamond, and it will true anything.  Of it looks actively sharp, you might see if it conducts electricity.  Carbide does, diamond is sorta, maybe, if its doped... but mostly not.

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