How to Sharpen Transfer Punches

[HMF]

I bought some transfer punches on Ebay, and need to sharpen them back into shape.

Does anyone know a method of doing it properly?

Thanks.

Oz

 

[Tony Wells]

I've done a few with collets in a lathe using a tpg. Ideally, an OD grinder and a spin jig with collets. Don't grind too much away, I believe they are only case hardened. You might get by with turning a new point, using carbide. Still, best done in collets for concentricity.