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Messages - Tweakie.CNC

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3211
Hi Terry,

The test rig just has a felt pad friction type of tensioner for the wrap wire - it works but it is crude and only suitable for testing.
I am not yet sure of the benefits but measuring the wrap wire tension as close as possible to the actual wrap seems to be favored so I am currently working on an electronic device which uses a rotating version of the conventional 'dancer' to measure the actual tension in a feed-back loop to a disc brake on the wrap wire spool. This will be fully adjustable, for the different wrap wire diameters, and provide 100% repeatable results - assuming it works.

The full size machine has just gone through it's third rebuild but I think it is going to be a long way off before it will be winding a full set of strings.  ;D

Tweakie.

3212
A short video winding nickle wrap wire onto a music wire core.

https://www.flickr.com/photos/tweakie-cnc/15565495153/

At the moment tests are limited to 2,000 rpm as I have encountered technical issues when running these 200 step per revolution motors at speeds over 2,500 rpm.
I am currently awaiting delivery of some different (24 step per revolution) motors which should be good up to 15,000 rpm whilst, hopefully, still having sufficient torque for the job.

Tweakie.

3213
Hi Wadero,

If it would be of any help to you - zip and post a copy of the Gcode which has the problem I will run it and see if the problem occurs here.

Quote
DRO  is consistent with position and not with the instruction.

One possible explanation is that you are mixing G90 / G91 commands in an incorrect manner.

Tweakie.

3214
General Mach Discussion / Re: Just a general question…
« on: December 30, 2014, 02:25:44 AM »
Thanks again Terry – I will try that.

Tweakie.

3215
General Mach Discussion / Re: Just a general question…
« on: December 29, 2014, 02:19:00 PM »
Thanks Terry - I am not sure just how I do that but it something I never would have thought of checking.

Tweakie.

3216
Thanks Terry - excellent information my friend.  ;)

Tweakie.

3217
Thanks guys for the kind words and encouragement. As soon as I can I will make a short video of the test-rig in action. It is rather crude and does not incorporate the refinements of the actual winding machine but it does demonstrate the principle.

Quote
‘WOW with the VAST variety of guitar strings and I do mean VAST. I cannot image needing to wind your own.’

I am inclined to agree with you on that one Terry – I am really not sure why but, as we say here, “There is nowt so strange as folk”  :)

Quote
‘But getting the proper tension on the winding wire AND the core wire might pose a problem.’

I have found that getting an exact, ‘pre-defined’ tension on the core wire is extremely easy but an exact, ‘pre-defined’ tension on the wrap wire may yet require a bit of cunning electronics (on the test-rig the wrap wire tension is set by ‘trial and error’ but, as yet, I have no way of measuring it precisely).

There are still a number of technical issues to be overcome but I am getting there slowly.  ;)

Tweakie.

3218
General Mach Discussion / Re: Just a general question…
« on: December 29, 2014, 01:23:52 AM »
Thanks Hood, I am sure you are correct.

Tweakie.

3219
Show"N"Tell ( What you have made with your CNC machine.) / Guitar Strings.
« on: December 28, 2014, 02:56:24 AM »
Despite the high levels of technology that have been incorporated into professionally manufactured, machine wound, strings the demand still exists for the purpose-made string (like there is sound and there is sound there are strings and there are strings – there can be a world of difference to those with a trained ear).

A good friend and Luthier has been making classical Guitars and manually winding his own strings for many years now and together we are investigating CNC machine winding. My involvement is solely with the Mach3 side of things and to this end I have adapted Benny & Brian’s Coilwinder screenset for the purpose.
In order to check my macro code and attempt to resolve some of the mechanical issues I have constructed a small (1/8 length) test rig and thought these pictures may be of some interest to others.

It’s early days yet and it can only get better so stay tuned folks.  ;D

Tweakie.

3220
FAQs / Re: Losing zero reference while cutting
« on: December 28, 2014, 01:45:37 AM »
Hi Scott,

From what you describe it sounds like the problem may all be down to the PC.
Run the DriverTest.exe (Mach3 folder) and see what results you get.

Tweakie.

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