1/4 scale Porsche 917 180 degree V12 Build

[steamer]

Not a real productive weekend boys and girls..     i was able to make the arbor...check... I think I'll be fine with the gear cutter....god I hope so...

But NO MATERIAL>      I could have sworn I had a good foot of 1.5" 1144 sp......but I didn't ......

SO

I started on the con rods   I did the programing and it became apparent that the inverse screw location was a PITA!     So I flipped it as I was sure I could put this all together in the end.      Then I spent some time programing the conrods...and probably in pairs...which is where I left off ....mean while I've had a few doctor trips for my Daughter,   and the honey do...so It's been less than Crueby levels of progress.....but I did watch Lemans last night as I tried to get myself to sleep....good movie.....Love the main character!.....

Cletus You'll be gettin a package shortly

[Johnmcc69]

 
 

 John

[steamer]

Connecting rod blanks going through Op 1.  Rod bolt holes. 
After that, then the cap is machined and parted off, and then bolted back on and finish machined.....1 in the machine and 11 more waiting their turn

Meanwhile, Cletus has started the heat treat process!   

[Admiral_dk]

It's probably just me .... but unless it's a test piece in the oven, I'm not getting it 

Looking forward to see how you hold those blanks while the CNC does it job 

Per

[steamer]

Yes Eric is testing a coupon part to verify the process for 57Rc.   

Dave

[Jasonb]

Good way to contour the caps and part them off in one go, avoids the bolt heads getting in the way if you do the contour on the whole part.

Will you tap in the CNC or don't you have that facility as I noticed you did not seem to do it for the crank webs.

[Don1966]

Still with you Dave but I didn’t know Eric had a hardness tester…..



 
Don

[steamer]

Good way to contour the caps and part them off in one go, avoids the bolt heads getting in the way if you do the contour on the whole part.

Will you tap in the CNC or don't you have that facility as I noticed you did not seem to do it for the crank webs.

Thanks Jason     my thoughts exactly.  Uses less material as well.

Holes are deep so a pecking pass is in order as well as doing the cobores first.

Dave

[Admiral_dk]

I think you can see the stainless steel wallet used to prevent oxidiation of the item being heat treated.

Oh yes - that trick I've heard about before    - but as I have never hardened anything (on purpose) .... it didn't show up in my ready memorybank 

[steamer]

"Will you tap in the CNC or don't you have that facility as I noticed you did not seem to do it for the crank webs.?


No I dont have rigid tapping capabilities, but 7075 T6 is pretty easy to tap.

The only down side to doing the cap this way is the drilled holes are deep and blind.   Gotta go easy  and let the chips come out.

Dave

[Admiral_dk]

Dave - I'm sure that your CNC can do 'single point threading' and I would be rather surpriced if it isn't good at it .... but of course it requires the right Tool in the holder + G-Code.

Per

[steamer]

Hi Mike    I use the canned peck full retract as well.   10 dia deep is still deep....but I just let it do its thing

Dave

[steamer]

My machine will thread mill, but as thread mills are expensive and I have taps...I'm going to keep it simple.

Dave

[Jasonb]

I think Andrew who also has a Tormach uses a tapping head together with spiral flute or point taps and can run them at about 500rpm in aluminium at M2 or M3 sizes. Biggest advantage is that they will be nicely lined up under the spindle.

I usually just use F360s pecking option for deep holes

[steamer]

Whiskey has been hard at work doing some heat treating   crank pins in the furnace and quenching

Dave


PS   I think he has some splainin to do regarding that fly press!