Another effort, 2 cylinder inline water cooled

[balsaman]

Crap, wrecked the first chunk of aluminium....

It's been a couple months and I forgot to subtract the edge finder radius when I zeroed the stock.

Will cut another.....

[nick.gilling]

Well never mind, at least you know where you went wrong!!!

Be sure to post up pics of the results.

Nick

[nick.gilling]

Hi Eric,

Engine is looking good. How are the cams locked onto the shaft?

Any more progress? Any luck with the machining this time?

Nick

[balsaman]

I was away for a week. Be back soon with more progress....

Eric

[balsaman]

First chunk is in progress...before and after. More operations to do on this part. It's the top half of the crank case.

[nick.gilling]

Good wor there, very interesting to see this one come together.

[balsaman]

nice radius'

[balsaman]

more progress

[nick.gilling]

Looking good, you must be chuffed with your DIY cnc mill!

How many cuts did it take to profile the inside? How long did it take?

Also, how did you cut the external radii? with some kind of router bit?

Excellent stuff!

[nick.gilling]

or did it just take a lot of cuts stepped down?

You've probably gathered I don't have a clue how a CNC works!

[balsaman]

I love my mill.

Inside took an hour or so to cut out with a .25 em., .050 deep steps down.

Outside radii was done with a .375 ball mill with .005 step over

I used a cheap edge finder to find the edge for the inside pocket and that's the last time I use it. The inside pocket is out by over .010. Won't matter but it bugs me.

Eric

[Stevie]

Eric

Use a 1/4 dowel pin
Run it about 500rpm
Lightly touch it with a magic marker
Move it to the edge very slowly (like 0.001 at a time)
Once you see a scuff of the black and see the steel showing through; you have the edge