Here's the Taig mill with it's WC pan adapter motor cooling shroud :) The mill was purchased from Peatol Machine Tools. It's now been sold on after a few years of reliable working and is being replaced with a Sieg SX3 which is being converted to CNC now.
The tray and limit switches are now sorted out, I've still got the sides and back of the enclosure to do, but it's getting there. I need to tidy up the cabling but I can't do that until I make the back.
Here are the details of the limit switches - since taking these photos I've modified the Y axis limit as the rubber guard at the rear kept tripping it! There's also a picture of the motor mount adjustment, this has been modified twice as drive motors changed.
Here's a recent picture of the Taig doing an Engraving job on an MDF sub-bed - cutter is a solid carbide single point 0.006" tip running at 7500 rpm, feed was 20 ipm - no problems run dry in Engravers Brass. There's another Engraving job shown on my Engineering Page. I've made a bed plate that gets used for engraving now, the MDF still gets used if I'm drilling or milling through.
I've now finished my 4th axis - it's simple and it works fine. Made from a spare spindle, and a few bits of aluminium I had lying around. The ratio is 72:1 and even with a little 0.7A stepper motor it's virtually unstoppable. Using 5 microsteps gives a resolution of 1/200th of a degree. Backlash is adjustable by moving the motor on it's mount. The worm and pinion were run for half an hour with Solvol Autosol metal polish to bed them in and then the backlash was re-adjusted - it's nil :) The test piece was just to prove engraving/milling was possible wrapping A axis. See my Engraving page for further information.
I had a problem with the X axis gib screws. The design is flawed in my opinion, it relies purely on grub screws staying put, with no locking device. The motor side one was slack from new, and on a recent job decided to come loose. This has a really nasty side effect, it allows the carriage to move freely to the right and jam to the left!!
The cure is simple, throw away the grub screws and replace with longer bolts and a locking nut as per the Y axis.
10-32 bolts are not easy to come by in the UK, so I re-tapped 5mm and used those.
ER-16 Spindle conversion.
I finally got around to making an ER16 spindle, It took about an hour. I used
a spare head assembly and pulley.
Here's a few pictures that show the top and bottom bushes and the completed head.
Copyright © 2004 Steve Blackmore