On 10.01.16 09:45, Marcus Bowman wrote: > On 10 Jan 2016, at 00:22, andy pugh wrote: > > > On 5 January 2016 at 11:34, Dave Caroline <dave.thearchiv...@gmail.com> > > wrote: > >> Here is an example of with and without limits in a trunnion design > >> http://www.ebay.co.uk/itm/CNC-Rotary-Table-Dividing-Head-Rotational-Axis-4th-5th-Axis-A-B-Axis-100MM-Chuck-/161679996211 > > > That's an interesting configuration. There are a lot of small > attractive looking Chinese 4th axes at reasonable prices, but I do > have reservations. If I coudl be convinced they were accurate, I would > happily order one; but other Chinese accessories are not of the > standard to which I aspire, so I'm hesitant.
ISTM that the table can only tilt +/- 45° or so. Since the need for a symmetrical swing is obviated by rotation of the chuck, I'd rather have one which could swing 90° one way, from horizontal to vertical. The coarser axis has a resolution of 0.3°, assuming 1.8° steppers, and holding accuracy will be a function of cutting forces, I figure. If anything finer than full steps are attempted, holding torque quickly goes downhill. A clamping brake on the table would be a handy addition. (A cone brake might might minimise misalignment as the brake is applied?) Erik ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
