1/4 scale Porsche 917 180 degree V12 Build

[crueby]

I believe Chris means the picture attached here. The gear A (crudely arrowed) should be moved over - which is what Dave was saying - a broken mate. I get that in solidworks plenty, just the same as Fusion 360 I'm sure. The number of times I've put an assembly away, only for it to fly all over the place when I open it the next day.............. 

Happens with Alibre too, if you don’t get everything constrained properly.

Dave: many ways to get it wrong, only one way to get it ‘right’.  You’re making progress, regardless of the setbacks.  Looks GREAT.

Back when I was a student in engineering, a student asked the professor once, “Professor, why don’t you give partial credit for test answers that are nearly correct?”.

I loved he’s answer, “When you get it ‘almost right’ the rocket still blows up”. 

Classic!

I hear ya.    7000 pound load test piece for diamond turning lathe.   The hydrostatic spindles were mine.   
Chucks are 24"

It held the load so my math was right

Wow. You must have had BIG shop elves!

[steamer]

OK   Oil pump body parts and covid test today......and a presentation for Monday...........

I did get my gear cutters that I need....

Dave

[Roger B]

With big stuff you usually just get one go so better get it right An impressive lathe.

I can screw things up with pencil and paper or 2D CAD   

[steamer]

With big stuff you usually just get one go so better get it right An impressive lathe.

I can screw things up with pencil and paper or 2D CAD   

Yeah there was a half a million sunk into the one of a kind spindles alone .....no pressure.....

[steamer]

First ops complete on the pump parts, and the fixture is made.    Not much to talk about this weekend, but hopefully more this week.    I have the fixture which should allow the second ops on the pump body.   The we cut some gears....

Worked this weekend.......sigh....

Dave

[steamer]

finishing off the vises for the group this weekend, and i'm painting them...perfect time to get some work done on the 917 engine    Oil and scavenge gear pump bodies up to 2nd op   next is to drill the passages....
water bottle cap for reference...

[crueby]

More great details.   

[stevehuckss396]

Nice to see you back to making parts.

[steamer]

Working too many damn hours...

[stevehuckss396]

Yeah me too. I'm on ten hour days, 7 days a week and we are bout to go to 12 hours.

[Craig DeShong]

Yeah me too. I'm on ten hour days, 7 days a week and we are bout to go to 12 hours.

I remember those days… Being retired it’s a memory, I didn’t say a fond memory either.   

[Art K]

Dave,
Great work on the 917! I had a problem with the assembly on the Offy. I was constraining two flat surfaces and two opposite corner holes on a cover plate. It would only constrain one and would rotate around it. After seeking help on Alibre forum it was found that the holes were .0005 off and didn't match up. I fixed that and all was good. I had been working five 10 hour days since January 2020. I get to quarantine the rest of the week as I tested positive.
Art

[steamer]

Art, Craig, Steve and Chris
Be safe out there boys!    and thank you very much for looking in.     Work has been crazy since our new release, and I'm already neck deep in a new project, so at least they want me to stick around.

Art.   It's really hard with these small parts to be assured of geometry.   The best palliative ive found thus far is to do all the machining in one set up.   Even that doesn't always work.    The end cap on the pump doesn't seem very flat, and I suspect it will need to be remade for instance.    Getting 4 parts to string together on a 1/8" shaft is asking for trouble.....
I hope you get through your quarantine uneventfully and get back neck deep in that little Offy.....that's a sweet build!

Dave

[steamer]

Well  It appears I'll be able to save that part, and I've started on setting up to cut the gears for the project.    That includes the pump gears, the pump drive gears and all the cam shaft drive gears.....I think I'm just going to get all that out of the way.  I also need to update my lathe mounted keyway cutter as I've got some keyways to make as well....much to do

I just finished my small part of the vise project with Nigel over at Go Create Hobby Machine Shop on YouTube.      Now that's done, I should have a bit more time.    I want to get the gears done before the good weather really gets here....."Rushforth" has been languishing far too long, and she needs to have her repower completed, and be used!!!

Dave

[RReid]

"Rushforth" has been languishing far too long, and she needs to have her repower completed, and be used!!!

Glad you're making a bit of headway, sounds like you're a busy boy. So what's this "Rushforth"?