Originally posted by Top Gun 777
A lot of different materials can be use to make lapping tool ( different aplication ) and for this particular I am using "Garolit LE" ( see McMaster car catalog page 3344). I will try to describe it as I can.
It is made out of round bar -50 mm diameter and 25 mm thick.
it has hole on center 13.8 mm and it is like adjustable clamp.
First I cut outside diameter on lathe to 50 mm, then I made a bore 12 mm. Then I cut that to 25 mm long. Next step is I made to three cuts ( under 120 degree) from out side to center. Two of them go only to half way and last one is all the way to 12 mm hole. Next step I made a hole on the place where the complete cut is ( right angle) on one side of of cut I made 6mm hole and other side I threded M6.
Then I put it back on lathe and made bore to 13.8 mm.
Actualy tool is ready to use, but before use it, you need to lap this lapping tool. I use old dead pistons and lap them all the way- so I am making sure internal surface is round and smooth ( always mesure it with micrometer).
I need digital camera, urgent!!!!!!!!!!!!!!
Edward, if you need me to take a pic, I can take one for you at CP this saturday.