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| sbwhart:
Thanks Chaps Bernd thanks for the download info. A good afternoons work today making the return crank, this is a tricky little beast, I've had a good head scratch over it :scratch: all the drawing show it as one piece, however I think it will be easyer to make as two pieces and still function correctly. The drive pin is positioned relative to the drive slots and its position times the engine, you can get the position with a rotary table or you can use cordinates from the centre line, I've dimensioned the drawing so you can use either method. OK first job chunk of 30mm free cutting mild steel in the lathe turn down to 1" and put a small centre in the end, Keeping the job in the chuck transfer the chuck over to the mill with a centre in the quill wind it down tight into the centre in the end of the job, clamp the chuck to the table, Zero your dials or DRO, You've now got your centre datum. Then mill the face up to get rid of the centre its done its job and it will only get in the way down line, mill flats and then mill drive slot 3/16" Then to accuratly locate the drive pin move to drawing cordinates. Centre drill then drill with a number drill to give a tight fit on 1/8" silver steel, spot of loctite and press pin in using mill head. Transfer over to lathe turn diameter and part off, Face up the back, and thats the beast tamed. and this is where it fits on the crank Have fun Stew |
| NickG:
That part looks a nightmare to do! Well done Stew, 1 down 2 to go? It's going to be a powerhouse of an engine this one! Nick |
| Brass_Machine:
Loving this. Radials and v-twins for me please.. Nice. :bow: Eric |
| raynerd:
Machining of the return crank was superb! I learn a lot from reading your detailed posts.... please keep them coming :clap: :clap: :clap: |
| sbwhart:
Nick,Eric,Chris Thanks for your kind feed back Cheers Stew |
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