Pimping the mini-lathe

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06 Sep 2020 15:31 - 06 Sep 2020 15:45 #181024 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
I appreciate your advice here. Things I also should have done better:
- Don't be a cheapskate and use mystery steel I had, but buy something with a little more material to remove.
- Don't avoid cutting at the start (fix the band saw gearbox.)
- As you said, it would have been better to do smaller sections in the vise rather than the whole thing at once.

Oh well. Given the original ones only have that 3.7mm lower flange, I think mine will be more rigid.
Mark
Last edit: 06 Sep 2020 15:45 by RotarySMP.

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10 Sep 2020 17:36 #181662 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
I am trying to set up a tool table with five tools.

Using this prcedure:
linuxcnc.org/docs/2.4/html/lathe_lathe-user.html

It works fine to turning tools with can touch the outside of test peice, but I also have a facing tool angled such that the tip can't touch off on the OD of the test peice, and a center drill to set. I tryed doing a test cut until the facing tool got to the center of the test piece and then set tool X offset 0, but when I switched back to my already set turning tools, they were no longer returned to the correct diameters.

Any suggestions please?
Mark

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10 Sep 2020 19:34 #181672 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
After another couple of hours of mucking aound with it, I think my basic error was not having G43 active.

Do I need it active both during the tool table set up phase and while running programs, or off during set up and on running programs?
Mark

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11 Sep 2020 07:33 #181728 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
I found a different help file which says to set the G43 also when setting the tool table. Starting to make progress on this now.
Mark

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11 Sep 2020 09:04 #181739 by Aciera
Replied by Aciera on topic Pimping the mini-lathe

I found a different help file which says to set the G43 also when setting the tool table.


Hm, interesting. Could you provide a link to the document?

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11 Sep 2020 10:15 - 11 Sep 2020 10:16 #181741 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
I this one...
linuxcnc.org/docs/html/lathe/lathe-user.html

4.1 The X axis offset for each tool is normally an offset from the center line of the spindle.

One method is to take your normal turning tool and turn down some stock to a known diameter. Using the Tool Touch Off window enter the measured diameter (or radius if in radius mode) for that tool. Then using some layout fluid or a marker to coat the part bring each tool up till it just touches the dye and set it’s X offset to the diameter of the part used using the tool touch off. Make sure any tools in the corner quadrants have the nose radius set properly in the tool table so the control point is correct. Tool touch off automatically adds a G43 so the current tool is the current offset.

A typical session might be:

Home each axis if not homed.

Set the current tool with Tn M6 G43 where n is the tool number.

Select the X axis in the Manual Control window.

Move the X to a known position or take a test cut and measure the diameter.

Select Touch Off and pick Tool Table then enter the position or the diameter.

Follow the same sequence to correct the Z axis.

Last edit: 11 Sep 2020 10:16 by RotarySMP.
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13 Sep 2020 10:02 - 13 Sep 2020 10:47 #182003 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
E30 is up. The first time I used tool offsets, including a crash due to my lack of understanding combined with carelessnes.


Mark
Last edit: 13 Sep 2020 10:47 by RotarySMP.
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04 Oct 2020 10:21 - 04 Oct 2020 10:21 #184796 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
I just uploaded episode 31...

Mark
Last edit: 04 Oct 2020 10:21 by RotarySMP.
The following user(s) said Thank You: phillc54, tommylight

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11 Oct 2020 10:24 #185692 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Episode 32. This is to fix up a screw up I made.

Mark
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11 Oct 2020 12:39 - 11 Oct 2020 12:40 #185708 by machinedude
Replied by machinedude on topic Pimping the mini-lathe
A set screw should work just fine on your pulley.

one other thing that works well for protecting the parts in the lathe is to cut some aluminum strips the width of the step on the outer part of you lathe jaw then bend them around the jaw so they hook on the jaw. this holds them in place so it's easy to load your parts. once you make them you can take them off and on when needed if you can remember where you put them :)
Last edit: 11 Oct 2020 12:40 by machinedude.

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