1/3rd scale V10

[keith5700]

Yes, spot on. 93 cuts in total though. My dividing head is 9 degrees per turn of the handle, so that was the angle between cuts. I've just cut the second one tonight, that went really quick. Need to turn the telly off, and get into a routine. 3 hours for the second one. Don't want to make another ever though!

[billmac]

Keith -

"My dividing head is 9 degrees per turn of the handle, so that was the angle between cuts. "

Ah yes, I should have thought about that. I can well understand your reluctance to repeat the job. Superb work.

[keith5700]

Moving forward, the first step was to check the centre distance of the drive gears. theoretically it should be 22.05mm. It showed that anywhere between 22 and 22.1 would work ok.
I decided to get the rotors to mesh at 22mm centres and then run them at 22.04 centres, so hopefully they wont touch.



I put the end holes in after the rotors were done, so I knew the holes were concentric.



I ended up lapping them together with grinding paste.

[Roger B]

What can I say but 'WOW' ?   

[Greg Haisley]

  Beautiful craftsmanship and anodizing Keith!!! 

 

[cfellows]

Wow, would never have guessed something like that could be done in the home shop.  Nice work!

Chuck

[KB]

That was certainly worth all of the effort put into that superb set-up. Outstanding!

[fumopuc]

Speechless but still following along.

[mike mott]

Amazing piece of work, also the set up to get there.

mike

[DavidF]

How did you model the rotors? Ive been trying to figure out a set myself. 2 lobes is pretty easy, but 3 lobed has been another story.

[keith5700]

Thanks again chaps. David, I googled 'supercharger rotor' and clicked images, and about 15 rows down, on the iPad, there was a drawing of a 3 lobed rotor. I drew this on autocad and then scaled it up to my size.its only 2d cad, so I meshed 2 rotors together and then spun them at 10 degree intervals to check the fit.
They were almost bang on, but I altered the profiles slightly to get them perfect and then made the machining drawings.
I milled the whole profile with a 10mm ball nosed cutter, in 9 degree intervals. I can let you have my drawings if they are any use, although I would rather wait until I spin them up and see if they produce any pressure first. I should know in a week or so.

Best wishes Chuck.

[Don1966]

Very impressive work Keith, that looks amazing.........I like..................


Don

[Steve76]

Hi, is there any recent news on your incredible V10 project? you're doing something I can only dream about doing and I can't wait to see and hear it running.

Hope its going well,

Cheers
Steve de Adman
(wannabe model engine builder)

[keith5700]

Well, I'm still here. Seems I'm not much of a poster, or photographer, but I have a few pics to bring me up to date.

I made the housing for the supercharger rotors, and the gearbox housing, and then ran the rotors together with the helical gears fitted.
there was loads of interference with the rotors, so I just ran it for a bit and then removed the contact spots, and then ran it again.
This time it contacted somewhere else, so I removed those points.

Anyway, I went through this rigmarole about 12 times and they were still catching. It turns out that even though I'd closed the theoretical centrelines of the gears up a couple of thou' there was still too much backlash between the gears to keep the rotors where they should be.
there is about 4 thou' movement at the rotor tips. This needs to be 1 thou' at a guess. I ordered some gears with slightly longer centerline and I'm going to mesh them together with grinding paste, to get almost zero backlash at the centres I'm now stuck with.

Sorry for brief explanations, I don't get long for lunch here.

Pics will have to be self explanatory for the time being:-

[Roger B]

Magnificent as ever    Still following and learning