On 15 May 2015 at 03:03, Gene Heskett <ghesk...@wdtv.com> wrote: > I had a session day before yesterday of the back gear countershaft > squawling pretty bad, so I called Chris at LMS and bought the whole > headstock for a $132 bill with USPS shipping, and which arrived today.
https://littlemachineshop.com/products/product_view.php?ProductID=2299&category=1023914534 ? I hadn't realised that the 7x lathes had a back-gear. My 9x (which seems to be a stretched 7x) had an all-belt arrangement (using the tiniest of V-belts) http://www.micro-machine-shop.com/9x20_lathe_belts_1.jpg You can drive it direct from the motor pulley for high-speeds and from the low-speed pulley for low speeds by moving the belt around. The belts don't look big enough for serious work, because they aren't. I replaced the whole thing with a 1kW motor and dual A-section V-belts. But if I had had a back gear I think that I would have wanted to retain it. What I don't understand is how it is possible to destroy the pulley. I can understand stripping the teeth off the belt, but how does the pulley get damaged? I don't think that Poly-V will give you any better results than the timing belt. But why not swap to a wider timing belt and a profile that it readily available? For example, this one: http://www.bearingboys.co.uk/28-5M-25_Metric_Pilot_Bore_Timing_Pulley-21256-p is for a 25mm wide belt and is under 2" dia, -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
