Enlarging Carbide sizing die?

[kywoodwrkr]

Has anyone tried enlarging the carbide sizer button in a sizing die by putting the die in a lathe and using a post grinder to enlarge it?
Or any other method?
Thanks.

[Reg]

Carbide is tough stuff, best to send it to someone who is set up to handle it. You might be able to cobble something using a tool post grinder and a "green" wheel providing you could find such a thing that small but the normal tool post grinder for most lathes can sometimes be a bit on the rickety side and most likely you will get a rough finish. With carbide sizers size is important of course but just as important is the actual surface finish. Most carbide bores are finished with diamond .

[kywoodwrkr]

Thank you for answering.
I have a rather good tool post grinder.
am aware of the diamond polishing compounds.
http://www.ebay.com/itm/12-pcs-5gram-Diamond-polishing-lapping-paste-compound-For-Metal-Polish-/180882278096?pt=LH_DefaultDomain_0&hash=item2a1d6c86d0
Am wondering how much can be taken off and how much effort it is?
Also will the felt polishing points be enough for the polishing step?
Also what finish is actually put on the carbide ring? 40? 5? .5? etc
Thanks again for answering.

[dragonrider]

Yes I have done, not a problem with the right tooling and stone. Opened up a Lee FCD by .002". Now it works like it should. I use a very fine diamond mounted point, did not do any polishing,

[kywoodwrkr]

Yes I have I use a very fine diamond mounted point, did not do any polishing,
Paul,
Thanks for the answer.
Do you recall the grit of the stone?
I see 100 and 150 available rather frequently.
Is the 150 fine enough?
Did you use liquid coolant?
Thanks.
Dave

[elk hunter]

You probably already know, but if you use any coolant it needs to be flood as heating and cooling will crack the carbide.

[dragonrider]

If I remember I will look tomorrow, that stuff is out in the shop separate from the house, and it 11 PM now., Hopefully I will remember.

[Mal Paso]

I used 320 grit Diamond on an inside die. Here's the post. http://castboolits.gunloads.com/showthread.php?t=145485

[MBTcustom]

I opened my LFC die up by .004 with a brass mandrel and 600 grit diamond paste.

[gnoahhh]

The trick is to use something soft as a polishing mandrel, such as wood or soft metal, that'll let the diamond paste grit embed itself into. We used to use a tapered wooden mandrel when polishing carbide wire drawing dies.

[Buckshot]

I opened my LFC die up by .004 with a brass mandrel and 600 grit diamond paste.

............What Goodsteel said. Use a brass barrel lap and diamond paste. For good prices on diamond paste and stuff try: http://stores.ebay.com/Diamond-Tools-International?_rdc=1

...............Buckshot

[looseprojectile]

things I ever did was pass on a pound of diamond dust at Goodwill.
Think they wanted a buck ninetyeight. Don't remember what grit it was.
I thought what would I ever need that for.
One of the many times I had buyers remorse for not buying something.

Brings up a question. What does the owner of a faceting machine do with the fine dust that results from its use?



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