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dquartermaine · Joined: 13 Jul 2003 Posts: 1 Location: Kettering U.K.

Hi builders,
As there are no questions on the board there must be quite a few experts out there. I am a self taught machinist ( I make lots of mistakes) currently building the Bob Roach/ Bruce Satra P&W Wasp Junior. As a way of getting this potentionally usefully facility working would anyone like to comment on making pushrods accurate in length and ballhead diameter. In my case 60mm long with 3/32 ball at both ends.
Strictly I.C. is sorely missed and this category could go someway to filling the void.
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daveq

wrenchmann · Guest

HI... Have you tried use ing 3/32 ball bearings brazed, to cut to length tubeing?? At the least they all end up being the same lenghth. be carfull , not to much brazeing material!! Do not worry about makeing mistakes!!this is how we get experince..I have made a lot of mistakes ,so I must be very experinced...just do not keep making the same ones over &over Good Luck and have FUN Smile

mrehmus · Guest

I was just shown a pushrod made from tubing with a ball-bearing welded to both ends with a laser. Very nice job, the balls won't crack and they were not softened on the wear surfaces. Looked like the world's neatest and smallest TIG welder did the job.

Mike Rehmus
Editor, Model Engine Builder Magazine
www.modelenginebuilder.com