| Gallery, Projects and General > How do I?? |
| ...mount this threaded backplate on my non threaded lathe? |
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| Rob.Wilson:
Sorry for BIG photo , using my phone to reply :palm: Forgot to say after mounting the back plate to the mandrel and screwing the bolt in I would centre drill the bolt head and use the tail stock for a bit more support . Rob |
| philf:
--- Quote from: RobWilson on December 11, 2012, 04:07:26 PM ---Sorry for BIG photo , using my phone to reply :palm: Forgot to say after mounting the back plate to the mandrel and screwing the bolt in I would centre drill the bolt head and use the tail stock for a bit more support . Rob --- End quote --- Rob, I didn't see the huge photo. I wouldn't have used a left hand threaded bolt! :lol: :beer: Phil. |
| Rob.Wilson:
:lol: :lol: :lol: Phil thought no one would notice the LH thread :doh: Rob |
| lesterhawksby:
Thank you so much, everyone. This is all making sense and I'm glad to have a strategy to pursue. I'm also a bit relieved that at least one of my thoughts was vaguely in the right direction, even if I did - erm - "bracket the target" somewhat! Andy - brilliant stuff about the calculation. I think I can do that. Bill - I see what you mean about a small pad to fit the thread. I did try my revolving centre against the backplate and the revolving bit just disappeared into the hole! Also, that lets me test my thread pitch before it matters... Rob - Good thinking and I think I can see how I can do that (without the threading) but I'm sufficiently impressed by that thread calculation I think I'll give it a go first. I could do with the experience. If I stuff up my threading I won't panic, just take it off and try your tactic :-) Looks like I know how I'm spending my weekend! (assuming I can get clearance from the appropriate authorities) :mmr: L. |
| andyf:
--- Quote ---Andy - brilliant stuff about the calculation. I think I can do that. --- End quote --- No brilliance involved, Lester. This did the sums: http://littlemachineshop.com/Reference/change_gears.php Tell it the required pitch, click the button to specify whether that's TPI or mms, and further down click for a 1.5mm pitch leadscrew. Then go back up a bit and click Calculate. Scroll down to see the results and a photo to show where the gears go. Mini-lathe owners say it's very useful for pitches which aren't specified in the manual. As Rob points out with unarguable logic, you can do it without the threaded bit. Still, it would be good practice if you aren't familiar with screwcutting, and you can always lop the end off if you make a hash of it, and proceed as per Rob. You would be wise to crank the spindle by hand, because the saddle will gallop along under power. Remember that as an inch thread is foreign to the leadscrew, you can't use the threading dial (if you have one). So, the half nuts will have to be left engaged throughout, and the carriage returned between cuts by cranking backwards, after backing the tool out a bit with the cross slide. Andy |
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