Rack & pinion vs ball screw drive

Re: Rack & pinion vs ball screw drive

Postby TReischl » Thu Jun 06, 2019 1:16 am

Leo, way, WAY back, like circa 1974 we had a tour of the P.F. Avery company in southern NH. HOLY SMOKES!

They were fabricating nuclear pressure vessels for power plants out of stainless steel. The tanks were made by cutting huge rings of 4 inch thick stainless steel and then welding them together. The vessel had to be about 10 X 20 feet tall. They used these huge vertical lathes to machine them. The operator rode in a carriage alongside the cutting tool, which, IIRC was a 2 inch square shank with the biggest piece of carbide for an insert I have ever seen. The material was coming of in a ribbon and could have been used for a coil spring.

I just looked them up on line. It appears they took a serious nose dive when all the folks got upset about nuclear power and are now an itty bitty consulting firm of two people. Looks like they reorganized in the early '80s.

BTW Leo, I looked at the video of your machine. Very, very nice indeed! I am thinking that "rubber" on the bed is actually a pretty good idea, not sure what it would cost to replace it eventually, but still a good idea. When we moved down here I scrapped the base for my machine since it was cobbled up from parts of Machine #1 base. Much more rigid now. But it is still not welded steel. I like the size of the columns on your base. Stout comes to mind.
"If you see a good fight, get in it." Dr. Vernon Jones
User avatar
TReischl
Vectric Wizard
 
Posts: 2922
Joined: Thu Jan 18, 2007 6:04 pm
Location: Leland NC
Model of CNC Machine: 8020 Build 48X36X10 RP 2010 Screenset

Re: Rack & pinion vs ball screw drive

Postby Leo » Thu Jun 06, 2019 1:21 pm

I have come to really like the rubber on the table top. I have resurfaced it a couple of times. I do use sacrificial spacers as needed, or sometimes just barely cut through into the rubber a few thou. I will replace it when the time comes.

I also like the TEE track.

Ted, truly, my inspiration to what I wanted was from you.
Imagine the Possibilities of a Creative mind

www.leosworkshop.com
User avatar
Leo
Vectric Wizard
 
Posts: 2957
Joined: Sat Jul 14, 2007 3:02 am
Location: East Freetown, Ma.
Model of CNC Machine: 1300 x 1300 x 254

Re: Rack & pinion vs ball screw drive

Postby TReischl » Thu Jun 06, 2019 9:13 pm

Leo wrote:I have come to really like the rubber on the table top. I have resurfaced it a couple of times. I do use sacrificial spacers as needed, or sometimes just barely cut through into the rubber a few thou. I will replace it when the time comes.

I also like the TEE track.

Ted, truly, my inspiration to what I wanted was from you.


Thanks Leo. But darn, my machine is nothing special, that is for sure! What I like best about it is that I can change it when I want to. After we moved I added another 4 inches to the height of the gantry so I could fit some bigger stuff I was doing under it. All I had to do was buy two pieces of extrusion and I was good to go. I also slide the y axis out about 2 inches so I could work on the ends of boards easily, doing things like finger joints. Hey! It is a hobby for me so I am supposed to have fun! :D
"If you see a good fight, get in it." Dr. Vernon Jones
User avatar
TReischl
Vectric Wizard
 
Posts: 2922
Joined: Thu Jan 18, 2007 6:04 pm
Location: Leland NC
Model of CNC Machine: 8020 Build 48X36X10 RP 2010 Screenset

Previous

Return to Hardware related questions

Who is online

Users browsing this forum: No registered users and 1 guest