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The Japanese certainly do use standard coarse threads; I have just replaced the bolts in the top yoke with standard M8 studs - they screwed straight in. What does help is to gently run a tap through the threaded hole. You should feel the difference between a tap cleaning corrosion and crap out of a ...

Pretty sure they're standard M10 coarse, which means a 1.5mm pitch (1.75mm is the standard pitch for M12 coarse). Coarse threads are the right choice for in a soft material like aluminium alloy.

Ian

Don't listen to them - the orange looks beautiful!

If I understand correctly, only the head snapped off - once the pan is off, you'll see a short section of bolt (probably without threads) sticking out of the crankcase. What's your plan of attack? Just using a stud remover might result in the bolt snapping where the threads start, leaving you in dee...

Really nice work!

When you insert the helicoils, are you using any kind of sealant / Loctite / epoxy on them?

Here's one you might consider: https://www.henkel-adhesives.com/ca/en/ ... icoil.html

Ian

Looking at the exploded diagram, spacer 8 fits between bearing 18 and bearing 19. if it's not there, tightening the nut on the end of the axle will put a huge axial load on those bearings. They are unlikely to last long, so yes, it looks like the spacer is essential!

Ian

The acid test for "will it do any good" is simple; without it fitted, mount a dial gauge first below, and then behind the gear spindle. As long as the lever is tight on the shaft, you can pick up on the lever (if enough shaft isn't available for the probe of the dial gauge). Change gear wi...

No, sadly, not in any way, shape or form. Different substance altogether. Grinding paste is usually made of particles of aluminium oxide. When compressed hard, they shatter and turn into an even finer grinding paste. They're also not especially pointy. This paste consists of tiny shards of tungsten ...

Nooo, it's ok Chris, I didn't think that! But it would have been very reasonable to; I knew the salesman well, I'd been going to his shop for a couple of years, he was one of very few honest salesman I met in Egypt (he was Armenina, real nice guy). When he showed me the stuff and said what it would ...

It's ok Chris, when the guy selling the stuff described it to me, that was my reaction too. This was in Cairo, around 1997. He took an M8 crosshead screw, clamped it in a bench vice, gave me a screwdriver and said "rip the head to bits". Which I did - to the point where the screwdriver had...

One of the probloems with this kind of job is that the screwdriver can slip out of the slot, thereby buggering up the slot and making further attempts at unscrewing even less likely to succeed. 1980's Japanese engine casing crosshead screws were famous for this. I came across a product called Regrip...

oops - forgot that pics all go in landscape, sorry!

I know this is getting further and further from handlebars, but... Finished the trolley. I use a 2 pack polyurethane for most things that I build, it cures quickly and lasts forever. I needed somewhere to store the clutter on my welding bench. Here's the result: The square plates bolt to the corners...

Hi all, Thanks for the kind words! Sick indeed - I've been collecting machinery since I was about 9 years old (late bronze age I believe). The hobby has spread like a disease - now covers metalwork, woodwork & electronics. I prefer the ancient cast iron machines over anything else - Chris, I hav...

Thanks Chris! The shaper is lovely to use, completely hypnotic. It's a dinosaur, I don't think they've made any for the past 40 years (maybe in India etc). I've never heard of a "CNC shaper", so, being highly manpower-intensive, they've become part of engineering history. Nobody wants them...