Ever used these retention knobs?

[rawen2]

Has anyone ever bought these retention knobs? Are they OK? http://cgi.ebay.com/NEW-CAT40-HAAS-P...QQcmdZViewItem
Thanks,
Ralph

[lkenney]

I haven't bought these pull stumbs but I have bought from this vendor and got fair market value for what i ordered.

Eagle

[Matt@RFR]

Let's see: There's no actual picture of the part, the price is, in my opinion, way too low, and the dude can't even spell 'machinist'. For something as important as pull studs, I wouldn't even consider these.

Try here: http://www.maritool.com/Retention-Kn..._68/index.html

[little bubba]

I bought some of those off of e-bay, I liked the cheap price. I tossed them all, the quality was fine, but look at the drawing, they are not a proper pull stud.
They have no shoulder(on edit "pilot") on them.

Go here to see, btw, 9.95 for proper pulls studs, even for a Haas
http://www.fadalcnc.com/#Retention%20Knobs.

Frank Mari explained a lot about pull studs over on the PM board a while back. CNC forum, something about broken pull studs. Worth a read if you get a chance.

[rawen2]

Thanks for the comments guys.
Little Bubba, thanks for the link and for the referral to the thread on Practical Machinist. That WAS an interesting read.
For anyone else that might be interested here's the link:
http://www.cnczone.com/vb...oken+pull+stud
As a newbie I really appreciate you experienced guys sharing your knowledge.
Ralph

[lkenney]

Good Morning all, It does pay to buy good tooling without a doubt, A savings of $3.00 is not worth the sweat.

By the way those digital Phase convertors shown on the FadalCNC website are pretty cool. You can get around some of the Power company restrictions of over sized motors for a rotary phase convertors by using these. There are older inline phase convertors that don't work as well for CNC machines.

Eagle