Air cylinders can be had for much cheaper off ebay. The Mcmaster link was more for showing what's avalible.
I'd be concerned about a bycycle pumps seals holding up over time, especially if pressures exceed 70-80 psi. Cheap used iron often can be found easier off of Craigslist than fleabay. ----- Original Message ----- From: "Gene Heskett" <ghesk...@wdtv.com> To: emc-users@lists.sourceforge.net Sent: Friday, April 22, 2016 5:32:46 AM Subject: Re: [Emc-users] Question on DM860 stepper drivers On Thursday 21 April 2016 23:29:21 Todd Zuercher wrote: > What length stroke do you need? McMasterCarr has 3/4" cylinders in > lengths up to 24". (1-1/16" up to 36") > http://www.mcmaster.com/#standard-air-cylinders/=12348ld Those prices aren't friendly enough though. I can rig springs for half that. But its looking like I'll have to make the springs anchors on the mill as I've pretty much had it with this 7x12, the rear gib strips vibrated loose yesterday and chomped up about $30 worth of carbide inserts from the chatter just making one of the 4 I needed last afternoon. I am in the market for a bigger, more iron in its ass lathe, but fleabay's lathe selections are in a high vacuum suckage state when I searched last night. One boxter? and one Monarch about covered what was available for under $1500. From the pix, neither had been taken care of and were missing parts. Quite a bit of new stuff, all priced higher than I could get it from Bolton or grizzly. Something in the 10x30 range I can convert might be attractive. Both of those 2 are within a long days drive from me, but neither adv listed the weight. And I know monarchs are at least capable of putting my GMC down on its snubbers. > ----- Original Message ----- > From: "Gene Heskett" <ghesk...@wdtv.com> > To: emc-users@lists.sourceforge.net > Sent: Thursday, April 21, 2016 6:45:49 PM > Subject: Re: [Emc-users] Question on DM860 stepper drivers > > On Thursday 21 April 2016 11:32:25 andy pugh wrote: > > On 21 April 2016 at 16:17, Brent Loschen <brent.losc...@gmail.com> > > wrote: > > > I'm curious if anyone has compared moving mass (pulley/cable/mass) > > > vs springs for counter weighting a G0704. Other than ease of > > > implementation, space requirements, etc., any real world > > > advantages/disadvantages of either? > > > > A spring will only have the right force in one spot, it will be too > > high or too low everywhere else. > > A pulley and weight can be exactly balanced at all times. But > > doubles the mass to be moved, so actually reduces peak acceleration. > > > > The ideal is probably a pneumatic strut with a relieving regulator. > > That isn't something we can steal off the tailgate of a > mopar/mitsubishi van for a $30 bill apiece. I also thought of that > but with a 1 or 2 lb propane tank to serve as the expansion chamber. > That would not, except for the piston friction, have a huge effect on > the accels or maxvels. Piston friction could be considerable though. > > Are there such beasts available, perhaps in a .750" or 20mm bore? > What I've found didn't have the stroke. > > Cheers, Gene Heskett Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
