Gallery, Projects and General > Project Logs
Oh Blimey I bought a CNC Lathe !!!!
vtsteam:
Andrew enjoyable to watch you work out every problem and improve this lathe.
The mallet adjustment reminds me of my first disappointments using a 4 jaw chuck, having plunked down good cash for it. I was used to tapping pieces on the Gingery lathe faceplate with a plastic mallet to center them. Using an indicator, you rotate the faceplate by hand, find the high spot, tap to half that reading and rotate to check. Tighten hold down bolts or whatever and go. What used to take literally seconds on the faceplate now took minutes of cranking back and forth (for me) with the 4 jaw.!
Later discovery through Doubleboost of the two chuck key method of adjusting a 4 jaw helped a lot, but sometimes I still feel that the faceplate tapping method was faster and easier for me. The only reason I didn't go back was because I wanted to train myself to use the 4 jaw quickly -- and because the faceplate on my Craftsman lathe has a big hub which blocks the most useful part of the slots. Most of the old workholding fixtures I made for the Gingery are too small for it.
Anyway, sorry to go on -- I love the fact that even on a big complex CNC machine, tapping with a mallet works well for precision adjustments sometimes!
awemawson:
--- Quote from: Pete W. on February 22, 2015, 09:03:50 AM ---Hi there, Andrew,
I think I might be able to match that fuse holder if you need to replace it. It might take some digging to find it, though! :scratch: :scratch: :scratch:
If your fuse holder is broken send me a PM with a close-up photo. I do know I've got a few of the type with the 5/8" fine thread fixing nut (I used one of those nuts to load the quill bearings on my Tauco bench drill!) :nrocks: :nrocks: :nrocks:
--- End quote ---
Thanks Pete, I'll take a photo
Steve thanks for the kind words - just now trying to get my head round the various offsets that have to be set to compensate for the tool post position - the description is just a bit stark! I need to work it from first principles
awemawson:
Pete,
With your encouragement I have at last fathomed out how this thing comes apart and managed to remove the broken fuse holder.
The original is a Rafi 1.04002 rated 6 amps @ 250 volts and holds a 20 mm fuse. Thread diameter is 14.75 by measurement (nominal 15?) and protrusion behind the panel cannot be much more than 30 mm including the terminals.
(It turned out that what appeared to be holding it together was actually holding an internal assembly on)
Pete W.:
Hi there, Andrew,
Red face here and big apologies to you!!! :doh: :doh: :doh: :doh: :doh: :doh:
I should have ensured brain was engaged before operating keyboard!!! I deserve a session of :poke: or even of :wack:
All the panel-mounting fuse holders I have are for 1¼" x ¼" fuses. You'd be welcome to have one or a few of those if only I could find them!!! I think they're in a cardboard box, in a bigger cardboard box, in a cupboard, behind lots of heavy stuff!!
I'm sorry if I've caused you to dismantle your instrument for nothing.
awemawson:
Pete thanks for looking - the offer was much appreciated :thumbup:
As it was apart I grafted a slightly smaller (12.5 mm thread) holder in by sandwiching it between two suitable washers, so at least the instrument is now much safer to use and I know what's inside. It looks like it grew like Topsey, rather than being a decent paper design - definite look of a prototype inside - in fact quite a bodge, but it works splendidly. I have a slightly more modern similar instrument by a different maker, but it has the same sensor connector - I tried one in the other and amazingly they are compatible so maybe there is a standard.
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