One of the continuing discussions on the Gingery "Make your own shop from scrap" forums were the lightness of aluminum castings and how that made them more susceptible to vibration. That's the biggest fault in my Gingery Lathe. I did cut some steel stock intending to create a stronger bed frame (filled with concrete) but then the South Bend Heavy 10L arrived and the Gingery is rarely used.
My feelings using epoxy and fibreglass is that it will suffer the same issues. OTOH, epoxy with granite filler has been used. But still in frames that by themselves are already strong. Perhaps a mix of glass fibre and granite would be the best. John -----Original Message----- From: BRIAN GLACKIN [mailto:glackin.br...@gmail.com] Sent: May 21, 2023 3:54 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Sewing Machine Stiffness Epoxy is a bonding agent Fiber (glass or otherwise) add cross linking in the resulting matrix. Thes two Used alone, the resulting composite will be weak. You need sized aggregate to make a much more rigid and robust structure. The epoxy is then strongest bonding all these parts together Sand and fines to fill the spaces between larger aggregate. The top size of the aggregate will depend on the thinnest portion of the structure but generally 13-19 mm max. During ww2 they made lathes bodies out of concrete with imbedded steel parts that were jigged in form or line bored for the spindle and tail stock. https://www.engineeringforchange.org/news/the-concrete-lathe-world-war-i-technology-meets-21st-century-design/amp/ Brian A guy that crushes rock for a living On Sun, May 21, 2023 at 5:41 AM gene heskett <ghesk...@shentel.net> wrote: > On 5/21/23 05:00, Nicklas SB Karlsson wrote: > > l�r 2023-05-20 klockan 23:28 +0700 skrev Thomas J Powderly: > >> > >> I saw an overarm router recently > >> > >> and wondered if a sewing machine frame was stiff. > >> > >> Compared to a desktop gantry mill. > > Gantry ought to be more stiff. > > > > > That depends on the gantry, my 6040's x rods could be stiffer than they > are, so light cuts are the order for smooth finishes. as is a mist > coolant directed at the tool. > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > 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, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
