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| How do I do this? |
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| Doc:
That cut would be what is called trepaning. Here is a link to some info on grinding up a tool for the job. Trepanning Tool |
| sbwhart:
Make it in two peices and press or glue or solder together. Stew |
| Doc:
Here is a picture of a very similar part being trepaned with a hand ground tool. And finished parts. |
| daz:
I did try making up another tool to try and see where I went wrong, and as Fergus OMore pointed out I didn't have anywhere near enough relief. The second one worked much better and got the job done. Thanks again for all the replies guys, all stored away in some dark recess of my mind for later use :nrocks: One thing I am still questioning about the part is why bother leaving all that material on? The part is there to connect onto a con rod and to seal the displacer piston, why not cut all that material away leaving just a shoulder around 3/16" long by whatever diameter is needed for a press fit, could even use a bit of loctite if required??? That would surely cut down on the weight even more. mmmhhhhh. I think I am going to have to make another one now just to see if there is any difference! cheers daz |
| winklmj:
Since it's not a precision cut--make one of these: Turned on the lathe and the teeth were cut with a Dremel tool. I used that to cut the spring seat in this part: |
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