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491  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 09, 2012, 12:59:50 PM
Here is the X ball screw with a locking nut I made:


It's 12mm diameter 5mm pitch Hiwin ball screw, preloaded to zero backlash. And forgot to mention the Z ball ball screw specs in the previous post: it is 14mm diameter, 5mm pitch.

The ball nut will be mounted to the cross slide with this mounting block:


Dan
492  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 09, 2012, 12:52:17 PM
Made a ramp for triggering Z home switch:


It's made from steel and mounted on the bottom of the ball screw mounting block:


Also made a bearing support for the Z ball screw floating end:


Dan
493  General CNC Chat / Show"N"Tell ( Your Machines) / Re: 9x20 Chinese Lathe Conversion on: April 08, 2012, 12:44:41 PM
Thanks Hood!

Sorry for the slow update. Have been too busy lately.

This is the ball screw I am going to use for the Z axis:


It will be mounted on the front, where the original lead screw used to be. I made a mounting block for the ball nut out of aluminium:


The mounting block will be bolted to the bottom of the saddle. And here is the mounting block I made for the bearings housing:


The bearings housing will go into the round bore and the stepper motor will be mounted on the opposite side. I will be using timing belt drive between them. The elongated bore for the motor will allow for belt tensionning.

Dan
494  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Just got a lathe to retrofit on: March 20, 2012, 03:16:26 AM
Thanks for the details, Hood. So the screw actually tightens the ball against the taper and so an O-ring is not needed. Slick.

0.25mm/rev doesn't sound that slow Smiley

I'll have to consider that... must be lathes serve as very good work benches Cheesy

Dan
495  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Adding a 4th axis to my mill on: March 20, 2012, 02:10:11 AM
Here, for your reference:

http://www.ntnamerica.com/pdf/2200/brgfits.pdf

http://www.promshop.info/cataloguespdf/a049-057.pdf

Dan
496  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Just got a lathe to retrofit on: March 20, 2012, 02:04:06 AM
Nice work, Hood. The adjustable nozzles are COOL! Is it just flat bottom bore with an O-ring? And I assume the bolt head holds it from falling out.

Hard to judge sizes and hence speeds on the video - looks like it's too slow on the Delrin? I machine Delrin with chip-break inserts at 0.15-0.2mm/rev.

Oh.. is it your cross slide or your work bench Wink

Dan
497  Third party software and hardware support forums. / SmoothStepper USB / Re: When, Oh When, are we going to get backlash compensation? on: March 19, 2012, 06:31:01 AM
Dave,

This is the plugin I am using.

Dan
498  Third party software and hardware support forums. / SmoothStepper USB / Re: When, Oh When, are we going to get backlash compensation? on: March 19, 2012, 05:39:00 AM
Dave,

I'm using Mach3 Dev version 057 and SS ver 17cd and it works fine here.

Dan
499  Third party software and hardware support forums. / SmoothStepper USB / Re: When, Oh When, are we going to get backlash compensation? on: March 19, 2012, 04:57:20 AM
Hi Dave,

It was a fix in the SS plugin. Or to put it better - an addition of backlash compensation code to the SS plugin.

Dan
500  General CNC Chat / Show"N"Tell ( Your Machines) / Re: Adding a 4th axis to my mill on: March 19, 2012, 03:47:48 AM
Check bearing fitting tables. The bearing fit in the housing doesn't have to be as tight as on the shaft. It's not an interference fit for that matter in most cases.

Dan
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