words cannot describe how impatient i am about this :willy_nilly:

:lol: Patience grasshopper. CNC'ing an entire car from scratch takes time.

Ofcourse, later :)
They are 90mm long, and the thread is 65mm.
The thread is Ø20mm with 1.5mm pitch (M20x1.5mm)

When I was an apprentice in fitting and turning if I did not use a 4 jaw chuck on anything but "bright" (ground or machined) bar stock I was kicked in the ass :)

NOTE: If it not my machine, and I am in a hurry I too like you abuse a 3 jaw on black steel lol.....

Then I'm going out on a limb and say it's bullshit :)
We use 3 jaw in our CNC-lathe, and all of the other manual lathes.
The only reason you want to use an 4jaw, is when to centre something that isn't at centre by it self if you know what I mean. But then we are talking 4jaw invidual.

I have worked in workshop for 10years, and have never heard of that you're saying:)
My "mentor" in lathe, have 25 years of experience, and have never done otherwise either.

You may have right, but they who learn you that, must have ment something else? For what reason?

Step1 done, someone asked how big they were, so... Pepsi :)
http://i815.photobucket.com/albums/z...2/IMAG1589.jpg

I'm not sure i can express how happy i am every time i see yo have updated this thread.

Lets be happy again then :)

http://i815.photobucket.com/albums/z...2/IMAG1591.jpg

Cause the parts are not round perfectly and the three jaws tighten on a common scroll/worm what happens is it stresses these, its basic theory, this is why on black steel you never use a three jaw chuck. Every workshop I have ever been in has been the same.

I agree with you and your boss though :) I basically never myself use anything but a 3 jaw :001_005: regardless of it being black or bright bar :icon_tup:

Thats maybe what you are going to fabricate. When we have low tolerance on the roundness, we turn the chuck with 3-jaw first, then clamp our parts.
Almost any CNC-lathe I've seen have only 3-jaw-chuck.

Have started to modify the A-arms I had for the old setup.

Before and after


http://i815.photobucket.com/albums/z...2/IMAG1596.jpg

http://i815.photobucket.com/albums/z...2/IMAG1597.jpg

http://i815.photobucket.com/albums/z...2/IMAG1598.jpg

http://i815.photobucket.com/albums/z...2/IMAG1599.jpg

New day, and the front suspension goes on...
Weld-nuts! Easy made in a manual lathe!

http://i815.photobucket.com/albums/z...2/IMAG1602.jpg
http://i815.photobucket.com/albums/z...2/IMAG1609.jpg
http://i815.photobucket.com/albums/z...2/IMAG1607.jpg

http://i815.photobucket.com/albums/z...2/IMAG1610.jpg
http://i815.photobucket.com/albums/z...2/IMAG1611.jpg
http://i815.photobucket.com/albums/z...2/IMAG1613.jpg