Lapping the cylinders

[ianmac]

Hi All,

I have machined the locomotive cylinders for a gauge 1 C36 class loco however the boring bar has left a fairly ruff finish.

I think it might be the speed that i am cutting at so i might take it out a few though furher at a higher speed.

I also could try a diffrent tool in the boring bar perhpas

Any ideas?

[SteveW]

Ian,

1. What material are you using?
2. Cutting speed/feed?
3. Tool type HSS/TCT?
4. Tip geometry pointed/round tip?
5. Feed method hand/automatic?
6. Lubrication?

[ianmac]

Gun Metal

slow speed not sure 1000rpm

hss
round tip no rake as it cutting bronze
hand feeding
no lubrication

sorry for the late reply

[Tel]

You'll probably never get the finish you're looking for with hand feed. 1000 rpm should be heeps of speed - my ol' Myford will only crank out 700 odd & it bores OK

[ianmac]

actually it might be 250rpm