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Messages - halfmill

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General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 10, 2017, 10:48:34 AM »
For Rich,

Ok I will get started on your first lesson today. again thank you.

For Gary Lucas.  Max diameter is three inches.  However I am running rather slow and shallow cuts, less than 1/8th of an inch and in soft wood--something like 15 inches a minute.  I have run on xy plane harder wood up to 100" per minute as a test.  4 flute end mill at 24,000 rpm... it did not have a problem with it.  Finally I tried holding the "round" from turning in the chuck and it had more than enough torque...so I don't think in my case with the material I am working with that I will have an issue.  thanks for the heads-up though.


General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 09, 2017, 12:24:43 PM »
Rich--Yes of course... I never turn down an offer to learn like that.  bob

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 08, 2017, 11:47:30 AM »
part of my class project is to produce on cnc a guitar bridge... I had to get special permission to do this... I think that class runs up to xmas break... but right now the "log" has to be "trued" so that I can cut a flat across the length of the log that holds the guitar bridge material...and so I would not want to flunk the course if I don't even get the thing made.  So that is why the pressure...and of course the whole idea is to get codes written for all my guitar parts...  now I do know that is a big order in terms of learning curve.  Also, though, the g-code help I am asking for cannot be that complex... one or two lines.  Of course I will continue to learn and develop along with others on the forum...I like doing this.

So maybe you could help me with one turn or revolution of a-axis and at the end of that my mill end moves .125 inches in the -y direction.  Can mach 3 not do that... is it limited in some way??

thanks, bob

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 08, 2017, 01:59:53 AM »
Now asking for G-code help.

I want to write a g-code line in MDI where the Y-axis moves .125 inches while the  4th-axis lathe moves one revolution.  That should not be too difficult, but I have not been successful to date...and I would like to figure this out in the next 3 days... I've spent a week already unsuccessfully.  Here is a typical line of code and the results.

G1 y-.125 A360 F10.000  Lathe started making a clicking sound, Y did not move and the lathe rotated about 1/2" of distance on the 3" diameter log (material).  I did not ruin the log as I had Z at home position up and away from the material.

2nd Try
G1 y-1.000 A2880 F3000
The lathe turns about the speed I would like for wood, but if it actually had the z spindle turning, it would cut a nice spiral, with about 1/2" between each turn of the spiral, whereas I am trying to get the spindle to "true" the wood log.  So the mill end would have to remain at the same Y position for the time of one revolution before Y advances .125 inches ahead down the length of the Y axis...   Now at F3000 the lathe will make one revolution in 7 seconds... I just need to get the y movement slowed down.

OK Guys, please help me with the G-code... bob

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 08, 2017, 01:40:14 AM »
Send me a PM with your shipping address. It's tiny, like 2" square.  Don't remember what I paid for it but it wasn't much, doesn't matter.
Gary I sent an email to you personally on 11/5/ or 6 /2017.  Did you receive it?   bob

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 07, 2017, 04:59:19 PM »
dude1, oh thank you for your offer... I will definitely take you up on your offer of  help.  Now people are throwing a lot of letters at me like in your case...PLC... where do I find a print out of all the contractions of words or letters so I can brush up on the vernacular.   bob

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 07, 2017, 11:29:29 AM »
Rich... to answer some of your questions to the last couple of your posts.

Seems like the gift from Gary will provide an option for you.

I echo what Graig and Gary replied about using CAD / Cam. Have not used Fusion 360
for the mill / router but have used it for the lathe. Have used Meshcam and Cambam to generate code for complex objects also. Like everything, there is a learning curve to using
CAD / CAM,  since you will need to create objects in 3D instead of 2D and understand
how to apply the software to generate code for a part. The software is all similar but some integrate the CAD / CAM much better, and also provide for engineering analysis. So it all depends on  the users needs. Make note that some folks are using industrial software and costs of the software alone are expensive. You would be shocked at the software monthly overhead  cost  ( more than what many folks earn ) paid for me when I was working.

 I am aware that these are very expensive ways to go--the route of software.  Fusion360 is currently free for anyone enrolled in college... and I don't think they are going to change that... so I enrolled in community college and am taking a mill class.  I thought that would speed up my learning curve and it has helped to some degree. However their machines are Haas etc., and I am never going to be able to buy something of that scale, nor would it fit in my small 400 sq ft shop. The problem is that no one has ever heard of Mach3 and they are not as knowledgeable about stepper motors etc. as I thought they would be.  Of course those machines use servo and not steppers and so forth.  So I am stuck with trying to learn from any source I can.

Secondly,  I am older -- 70, and we all know death will come soon enough.  Still there is meaning in life if we continue to stay in "learn mode" and continue to move forward.  In my life my curiosity has only intensified and I am never bored... so I think the cnc route has its psychological uses as well.  Finally if I got smooth enough with making the guitar parts, and there are a limited number, I would have the programs finished in g-code for each part and the need for fusion 360 would not be absolutely essential after that.  Of course it never dovetails that neatly. The fact that I am working the lathe axis issue so early in the learning curve is that this is what was being offered in class and I did not want  to wait another semester before getting started in some formal training.  If I learn enough g-code then mach 3 should handle all or most of my needs.  Right now I am trying to get my mind around the 4th axis lathe concepts and how that fits into my mill situation for making the bridge and later the guitar neck blank... classical necks are very complex compared to say, a fender guitar neck.  Mach3 appears to be very very deep in its use and complexity. He or she who figured all of this out...well they must of had a vast mind.

As a hobbiest most will never be able to rationalize big bucks for software.
Remember when AutoCad was rather cheap to use? Do you think Fusion will be provided
free or reduced pricing forever!

You will spend a lot of time learning and if free software is no longer available then where are you? All I am saying is put the cost of things into perspective for intended use and spend for what you want to be able to do. Can have anything you want in the store but once you bring it to checkout ya got to pay for it!  

I have already paid off the cnc machine, have it up and running, have my guitar shop set up and so forth...so I think I can weather the rest of what I must go through in order to come out producing fine and finer quality instruments...

For some simple stuff there is nothing wrong with a little hand coding to do a task and doing multiple tasks. Also there is experience gained in fooling around.

So much for my rant, it's just some thoughts FWIW, Please continue to rant and bring on more suggestions and ideas... bob

General Mach Discussion / Re: MDI question
« on: November 06, 2017, 07:11:45 PM »
ok thanks

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 06, 2017, 07:01:49 PM »
sent to your email... thanks bob

General Mach Discussion / Re: A-axis rotary lathe question for Mach 3
« on: November 06, 2017, 04:16:34 PM »
You are offering to send this to me, this device you already have?  bob

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