Calling all machinists...I need help with a decision

[bullnerd]

Re: Calling all machinist...I need help with a decision

Any pics of your machine SPence? I'm interested in how you run the Mach3 to the machine.

Spence ?

 

[cnc-me]

Re: Calling all machinist...I need help with a decision

One thing to keep in mind. You mentioned that with cnc you won't need a rotary table. That's not necessarily true. The size of arc you can cut on a cnc mill is limited by the amount of y travel it has so if you have a rotary table, hang on to it.

Yes sir, you are correct on that, did a job with 17" diameter grooves
had to use a rotary table as a Bridgeport V2XT is only good for 12".
The smaller grooves were done under CNC.

 

[bullnerd]

Whoa! Those plates look familiar, I designed a rotary table that was used under water. I made plates just like that out of stainless and used hardened delrin balls as bearings. Worked great and nothing to rust.

 

[Kevin54]

Whoa! Those plates look familiar, I designed a rotary table that was used under water. I made plates just like that out of stainless and used hardened delrin balls as bearings. Worked great and nothing to rust.

Bullnerd....I'm going to be the dummy here, but what are "hardened Delrin balls?"

I know what Delrin is as I have used a lot of it over the years, but I have never heard of "hardened Delrin".

Any links that you may have about it as I would like to read some about it?

Please don't take it the wrong way....I'm not disputing you, I'm just curious as to whether it may be something I could find a use for in the future.

 

[bullnerd]

http://www.mcmaster.com/#9614K59

I'm pretty sure they used to say hardened, but I could be wrong, we're talking 15yrs ago.They are pretty hard though.

I still have the test piece I made to prove to all the smartipants (people with degrees that never actually made anything with thier hands) that it would work. During the meeting, I had one of the managers that said it wouldnt spin with weight on it,stand on it. He was way over 300lbs. It spun so easily he couldnt even stay on it.

Anyway, yes, sorry to get off topic. I was just suprised to see those plates.

 

[cnc-me]

Whoa! Those plates look familiar, I designed a rotary table that was used under water. I made plates just like that out of stainless and used hardened delrin balls as bearings. Worked great and nothing to rust.

They were used as giant thrust bearings on house moving dollies.
Packed with 3/4" hardened steel balls and filled with grease.
And here is a plug for my friends company http://hofferlifting.com/

Whoops, sorry to the OP getting very off topic here.

 

[bobadame]

http://www.mcmaster.com/#9614K59

Wow, tensile strength: Good

 

[bullnerd]

Wow, tensile strength: Good

Yeah, right?

 

[Trucky]

I know I can't really contribute to the thread, but I must mention.. that McMaster Carr page made me laugh real good.

"...Additional specifications..... Balls. White."

Delrin is actually rather decent, even with a little compression. Lots of torsion? Probably not the best idea.

My favorite use? A 30-second file handle. Whatever shape you want. Works rather well with form tools.. heck, you can hand rotate the chuck and cut a form if you'd like.