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That looks like the one with total indicated runout of less than 1.27 microns. Should be good enough I reckon!

I had a package from AliExpress that was delivered somewhere (not to me) and I told AlieExpress that I didn't receive it and they said it's not their problem, it has been marked as delivered by the carrier. They did not chase it up. They flatly refused. I haven't ordered from them again.

The MOST fun I ever had (with microcontrollers) was in the mid 1990's on a PIC16C84 writing a protocol converter. It had to convert commands over RS232 to a proprietary protocol for a mining machine (and back). Programming the PIC in assembly was really fun. The 12C508 (now I think it's 12F508)...

What spec are you trying to hit on length? I know you say you want to get them as accurate as you can, but you should really get an idea of what you will be happy with. I'm NOT trying to be funny here, you should really decide what you will accept for this job. When you say your lengths are all...

Nice work! I look forward to seeing your next creation.

Yes that makes sense now I think about it. The main errors to control would be 1/ the relative error between hole separation distance on each end and 2/ from the centrepoint of the holes on the ends not being coplanar. Using the mill means the error in distance between the holes on one end would...

Any tips for getting the centre drill holes in the correct spots? Obviously, the first set it easy as long as there is enough material left to machine the crank when it is mounted in the lathe with them. But how do you get the second set to be as parallel as possible with the first?

Would a thorough running in on the bench (just the blower) help in this regard? Even going as far as heating the assembly up to engine running temperature. What's the clearance on a full size blower meant to be? Say a 6-71?

I hadn't seen this thread before, but I went back and read the lot. Nice work on a great engine! It's looking fantastic. It's amazing how many good workholding (and other) tips you can pick up on this forum.

This site reckons the angle for a 6-71 is 30 degrees. I guess the 8-71 would be similar. http://victorylibrary.com/mopar/blower/blower-GMC2.htm I guess the limiting factor on the upper helix angle would be that that the back edge of the rotor has sealed against the housing before the front...

Haha, and I'm the sensitive one. Output impedance of the source matters and it was unclear from the original post as to what it would end up being. True, that's not what OP asked, but are we allowed to probe a little to find out what he's actually trying to achieve, or should we all just stick...

Motorman1946, the answer is stick the voltage at 1.5V and the current will fall where it may. It's been answered. Round about 3 amps or so I believe the answer was. It's in the third post because you missed it. People digressed after that answer because tornitore45 didn't specify in the original...

If you rectify the 24V, you'll need a switch mode power supply to drop to 1.5V. Using a linear for the big drop will mean 2-3 amps at 24V which won't last long.

The biggest problem I had when I was a kid trying to start engines with glow plugs was the carbon zinc cells with their high internal resistance. Nicads and NiMh are so much lower internal resistance so the plug still glows in the presence of a cooling incoming air/fuel charge. If I was to...

Looks great! I'll remember your trick on my next project's cooling fins Matt

Hi Everyone, I have been a long time reader of posts (almost 10 years - yikes) and member of this forum. I live in Brisbane, Australia. I joined back in 2010 after I bought a Sieg SX2 mini mill to complement the Taig lathe my brother gave me. I had bought a Bolton No.2...