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Hi Tin Have you thought about Sheetcam? I have used a number of programmes but now use Sheetcam 100% of the time. It is IMHO a great programme - is in continuous development/update - is cheap - and the more you use it the better it is and the more things you can do with it. The dogbone conrod...

hi Chuck i think you did the right thing. I've used Mach 3 for a long time now and although IMHO it is time for an update or two there is no doubt it is a great programme. Everyone is different, does it their own way, swears by their own system and software, and has varying priorities but for...

Brian I'd like to tell you you are not on your own. I built a Ridders 2 stroke engine recently - I think to a pretty high standard. It did EXACTLY what yours did. It popped and banged under the starter and once ran for about 20 secs on its own, never to be repeated. I made a new piston and...

Brian You have 90 degrees between the tangent points. If you widened that to 95 degrees wouldn't you then have 190 degree cam action which can be adjusted to 10 degree BDC to TDC.... Or am I not thinking straight? Adrian

Hi Rob & Dan I'm building a Jan Ridders engine and had the same problem - now solved. Polly Engineering sell CI and I asked about the grade. It's equivalent to Jan's recommendation of GG250. They do a 50mm and 60mm diameter and 25 mm for pistons etc...

Hi Ken I've got the Chester equivalent. I got fed up with the bit of extra noise and move the gear train forward when not using it. Agree with Jason. Its VERY easy to get the similar washers and spacers in the wrong place. Guess how I know. If you change the gear train often it's not too hard...