Moteur oscillant double effect

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raynerd:
Stew, where did you buy your quality taps from?

Regarding the shop gremlins. They are real funny buggers, sometimes I find they take things never to be a seen again yet other times I can look for ages and then when I come to the shop the next time, they are pretty much where they should have been. :bang:
Chris

sbwhart:
The carbon taps I'm using I got from her https://www.maccmodels.co.uk/ their fine to use on none ferrous job, but are limited when it comes to steel they soon blunt and are prone to break especially the smaller sizes.

There was a special offer her http://www.mscjlindustrial.co.uk/cgi/insrhm look in the section marked inventory clearance, for small sizes of HSS taps at very good price indeed.

Stew

Ned Ludd:
Hi Stew,
Just to play devil's advocate, but what makes your taps "quality" when you describe them as "but are limited when it comes to steel they soon blunt and are prone to break especially the smaller sizes."?
Ned

sbwhart:
Ned

I had some carbon taps and dies that were made in India they were poorly ground, had no radial relief, burred, tore the thread and broke like carrots even when used on brass. I got them from Tracy tools, they seem to have two suppliers, good quality UK that come boxed and poor quality from India that are lose, they do supply good quality HSS at a reasonable price, so I'm always wary when it comes to where and who I buy my carbon tap and dies from as I know there's some rubbish out their.

Stew

sbwhart:
Another good mornings work.

First job was to do a little mod on the ports. I spent a very pleasant couple of hours with John yesterday afternoon tucking into a bowl of wild plumbs he'd picked and chatting, we got onto these engines and he told me of a little mod to the design he carried out. The pipe work connects to the standard with a bit of a flange coupling that bolts flush to it, what John does is to extend the pipe through this coupling so that it protrudes through into the standard this makes for a better air seal, the crap o cad shows what I mean. so first thing I sunk a 1/8" slot drill 3mm deep into the feed hole.

Next job was to drill the connecting holes down the end of the standard 2 holes are 27mm deep and 2 are 6mm deep if you mix them up you've got a scrapper. To get the standard square I took advantage of the squareness of my vice I simply bolted a parallel to the side and butted the job up to this, then by use of the edge finder got the centre of the standard drilled m2.5 tapping in the centre then used the PCD feature of my DRO to find the position of the other holes, I did the two 6mm deep holes first, followed by the 27mm deep holes again I marked the correct face to load the job into the vice on all the standards so I didn't load them wrong.

When all drilled I then tapped the M2.5 centre hole on the tapping stand: the V black is just to add a bit of support.

Here we are all done just one face left now before I mill the slot for the fly wheel.

Stew

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