Moteur oscillant double effect

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sbwhart:
Next op with the crank webs drill the off set holes, there will be two types 7 with one off set for the power take off and 14 with two off set for the engine crank.

First turn a mandrel with a nice fitting location diameter and a short length threaded M4, and a deep centre in the end

Then over onto the mill grip the mandrel in a chuck and with the chuck loose on the table wind a centre down tight into the centre in the mandrel, clamp the chuck firmly to the able thats it the mandrel is now accurately centered under the mill, zero your dials and off set 10mm.

Drill first off set hole 4mm in all the webs.

Put 7 aside then off set 10mm the other way and drill a four mill hole in the mandrel to take a pin, then using the first hole drilled in the web and a peg use this to locate for the second hole.

Drill the remaining webs with a 2mm hole.

Here they are all done with the mandrel

Stew

shoey51:
mate im impressed with your workmanship great work mate :bow: :bow: :bow: :bow:

madjackghengis:
Hi Stew, that's a real show with the set up for doing the mass production, those are some fine looking crank pieces, impressive looking, all stacked up on the rod, ready for the massive build. I like your technique getting all the 4mm holes done and then putting in the dowel to locate the discs for the second hole, looks to work a charm. :jaw: mad jack

sbwhart:
Thanks Graham/Jack

Well back in the shop after a short holiday with our son and his wife, he lives near Edinburgh (Scotland), August always a good time to visit Edinburgh as its festival time lots of plays and things going on managed to see a couple of fringe plays very good really enjoyed them.

So back to the build:- next job to shape the webs, drilling the holes all off the same jig lets you set them up like this.

Then nibble nibble nibble, flip them over nibble nibble nibble at you got them milled out.

For drilling the pinch hole use a couple of dowels to get them level and set your vice stop, center drill the first one then the next then the next etc etc etc. Then drill them all tapping drill, then drill half way through clearance then slot drill 2mm drill for the screw head.

The using the same trick over to the tapping stand for tapping.

The next job is to split the webs but for that I need to make a Arbour for a 1mm thick slitting saw, that's a job for tomorrow.

Stew

Stilldrillin:
Very nicely done Stew! :clap:

Still wondering what the third hole's for....... Last 2 pics. :scratch:

Guess all will be revealed, eventually! :thumbup:

David D

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