Recent content by jack620

I Googled chicklet and I'm still none the wiser. Can you provide a drawing of what you're making?

It looks good to me Timo.

ouch.

I recommend these guys: conon motor A bit more expensive than eBay, but they offer good support and the manual that comes with the VFD is reasonably easy to understand. My PD is mid-80s Taiwanese. I was able to dispense with the intermediate pulley. I replaced it with a belt tensioner. Sorry...

Hello Baltic and welcome to the forum. The VFD I fitted to my pedestal drill has an adjustable PWM frequency so you can select a frequency that doesn't annoy you. Perhaps yours allows this too?

Yes, you're right. This video explains: https://www.khanacademy.org/science/in-in-class11th-physics/in-in-thermal-properties-of-matter/in-in-thermal-expansion-in-solids/v/thermal-expansion-of-ring-class-11-india-physics-khan-academy

No worries. I made some edits while you were posting. I reckon a test is a very good idea. The Q sounds like the perfect place to do the heating.

Hi, while researching many websites on shrink fits (in steel) I came across the following rule of thumb: allow 0.025mm (1 thou) per 25mm of diameter for a shrink fit I heated the outer piece to 200C in my kitchen oven and cooled the inner piece in the freezer. I still needed to give the inner...

I'm not one to sell tools (my kids can have that pleasure when I'm gone), but I've read that engraved tools attract lower sale prices. Some say up to 50% lower. So probably not a good idea to engrave expensive tools. Perhaps engraving the size doesn't devalue the tool as much as engraving your...

I didn't know such a beast existed.

Gordon, Unless you have superhuman vision, you're going to need a loupe to read the engraving on a ⅛ diameter tool. In which case why not just reach for the digital callipers and measure the diameter of the tool? If the tool I want to use isn't in its original packaging with the size marked on...

I seriously doubt that.

Fair enough Brian. I haven’t tried lapping a big piston. which confirms my thinking that the fit of the piston isn’t critical for a piston with rings. There are thousands of engines being mass produced every day without lapped pistons.

Brian, a VFD will solve that problem. When the speed is very slow, the torque is low enough that you can stop the lathe with your hands. You would have absolutely no trouble stopping my lathe with your T handle.

And doesn't that prove that the fit of the piston in the cylinder isn't terribly critical for a piston with rings? Because if it was, a cold aluminium piston wouldn't develop enough compression to start the engine. True. And my clapped out old lawnmower would be impossible to start. And yet it...