Re: [Emc-users] Spanning beam lathe stand

2017-10-08 Thread andy pugh
On 8 October 2017 at 01:45, Chris Albertson wrote: > Has anyone been able to measure column flex. I haven't measured it, but with my mini-mill you could slap the side of the head and watch it all go "sproing". -- atp "A motorcycle is a bicycle with a pandemonium

Re: [Emc-users] Spanning beam lathe stand

2017-10-07 Thread Chris Albertson
You would NEVER bolt a machine to a building. If you are worried about flex, You might double up the column and connect that to the base. You might add 50pounds of steel but you'd still not bolt that to a building Has anyone been able to measure column flex. Possibly with a nail indicator.

Re: [Emc-users] Spanning beam lathe stand

2017-10-07 Thread andy pugh
On 7 October 2017 at 18:33, Chris Albertson wrote: > Of course no one here worries about nanometers, but still those ideas > posted here about bolting > a milling machine column to a wall are exactly backwards. I think that depends on whether your interest is in

Re: [Emc-users] Spanning beam lathe stand

2017-10-07 Thread Chris Albertson
If you look at semiconductor fabs where that make parts with features sizes as small as 10 nM now they seem to never bolt equipment to the floor. No matter how strong your machine is, bolts will distort the frame. They take strong measures to isolate the machines from the building. Of course

Re: [Emc-users] Spanning beam lathe stand

2017-10-07 Thread Gene Heskett
On Saturday 07 October 2017 12:30:05 dave wrote: > Rather a cute idea. :-) > So taking it a step further ... use a double column of CMU for the > headstock and a single column to support the tailstock. > Epoxy the CMU to make a good column but don't epoxy to the floor. > Use a rod end or

Re: [Emc-users] Spanning beam lathe stand

2017-10-07 Thread dave
Rather a cute idea. :-) So taking it a step further ... use a double column of CMU for the headstock and a single column to support the tailstock. Epoxy the CMU to make a good column but don't epoxy to the floor. Use a rod end or automotive ball and socket to relieve stress on the

Re: [Emc-users] Spanning beam lathe stand

2017-10-04 Thread John Bald
It does seem a lot simpler now...assuming I understand the whole idea. So the only difference in the stand itself is the single contact point on the tailstock end? There is nothing different on the headstock end then, correct? I like your idea about using the Chevy truck upper ball joint in my

Re: [Emc-users] Spanning beam lathe stand

2017-10-04 Thread Gene Heskett
On Wednesday 04 October 2017 05:43:19 andy pugh wrote: > On 4 October 2017 at 02:32, John Bald wrote: > > Has anyone built or familiar with the "spanning beam" or "torsional" > > beam lathe stand? > > It seems to be giving a fancy name to a simple idea. > > I would imagine

Re: [Emc-users] Spanning beam lathe stand

2017-10-04 Thread andy pugh
On 4 October 2017 at 02:32, John Bald wrote: > Has anyone built or familiar with the "spanning beam" or "torsional" beam > lathe stand? It seems to be giving a fancy name to a simple idea. I would imagine that a single pin joint at the tailstock end would isolate the

Re: [Emc-users] Spanning beam lathe stand

2017-10-03 Thread John Bald
Ok, I see what you mean now. That's very interesting. I was wondering what others thought about the torsion beam idea in general and if anyone else had built one what their experiences/impressions were. My shop is inside of a customized old semi trailer, so there is no foundation footings and a

Re: [Emc-users] Spanning beam lathe stand

2017-10-03 Thread bari
My point was more on the shape and arrangement of the beam/s when using epoxy granite with metal tubes and beams than epoxy granite and its formulation. -Bari On 10/03/2017 09:03 PM, John Bald wrote: > Isn't that the same thing as the epoxy-granite used for machine tools > I mentioned in my

Re: [Emc-users] Spanning beam lathe stand

2017-10-03 Thread John Bald
Isn't that the same thing as the epoxy-granite used for machine tools I mentioned in my original post, or is this something different? Sent with AquaMail for Android http://www.aqua-mail.com On October 3, 2017 8:51:17 PM bari wrote: Check out chapters 4 and 5 if you'd

Re: [Emc-users] Spanning beam lathe stand

2017-10-03 Thread bari
Check out chapters 4 and 5 if you'd like to see how to add dampening to a beam with polymer concrete/granite. Principles of rapid machine design https://dspace.mit.edu/bitstream/handle/1721.1/88839/45993343-MIT.pdf?sequence=2 -Bari On 10/03/2017 08:32 PM, John Bald wrote: > Has anyone built or

[Emc-users] Spanning beam lathe stand

2017-10-03 Thread John Bald
Has anyone built or familiar with the "spanning beam" or "torsional" beam lathe stand? users.tpg.com.au/agnet/cq9325rev4.html Some youtube videos about them too. Idea is based on methods used for lathes on ships. I wonder if one could fill the square tubing with epoxy-granite for added