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Messages - jimthefish

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1
General Mach Discussion / Re: treadmill motor for spindle
« on: June 08, 2019, 07:10:48 AM »
Due to space consideration on my Denford Triac I used a 180v treadmill motor and this controller. It worked perfect, didn't bother to run it through Mach, just used 240v household socket to the variable controller for speed and on/off control. One day might try and run through Mach 3 software.
https://www.ebay.co.uk/itm/Rotary-Knob-Adjustable-Motor-Speed-Controller-AC-220V-Input-DC-180V-Output/362279749427?epid=1038693158&hash=item54598e4733:g:GVQAAOSw~29b1pHC

2
I just use reverse for machine tapping with my tap holder.

3
General Mach Discussion / Re: Jobs being Ruined (only just started)
« on: August 14, 2017, 04:41:48 PM »
I'm a hobby CNC'er so don't use complex programs but I always start my programs with a G80 in the first line, I used to teach CNC programming in the 1990 which again was very basic but insisted all my students started their programs with the first line with G0 (G21 or G20) G49 G17 G80 G40 G50 G90 probably over cooked instructions and things have moved on, but when dealing with students it saved lots of crashes and damage.
Hope this helps.
Jim

4
General Mach Discussion / Re: Jobs being Ruined (only just started)
« on: August 11, 2017, 09:15:05 AM »
just a thought, you might be retaining an offset or other code when the job has finished. This carries over to the next component. by shutting down your computer and machine you cancel all previous codes and reset all positions so all will be correct. make sure all your subroutines are cancelled at the end of the program as they sometimes carry over to your next component.

5
General Mach Discussion / Re: Sorry to be a pain again but
« on: January 08, 2017, 03:41:04 PM »
Just had a second look and your program does have a z 0 retract value at the completion of the program. And yes it looks as if you have forgot to enter a cutting depth in your CAD values, so the cutter just touches the top of the component. Can I suggest you practice putting some simple geometric shape programs in by hand to grasp the basics of CNC before you trust CAD software. Errors on CNC programs can be very expensive mistakes.
Best of luck in your CNC machining its a great skill to learn and lots of fun

6
General Mach Discussion / Re: Sorry to be a pain again but
« on: January 08, 2017, 03:14:31 PM »
Yes but remember CAD needs you to put in the values in a specific order, I don't use any CAD software I used to teach basic CNC in the 1990's so don't use or trust myself to use it as I'm a part time hobby machinist. You need to used CAD software everyday to become confident and not make errors. I forgot to say remember the tool will be in the material when its finished machining so make sure after the last cut there is a positive Z value. Something my students forgot to do, they would admire their work only to find a groove from the bottom of the component cut to the home position.

7
General Mach Discussion / Re: Sorry to be a pain again but
« on: January 08, 2017, 02:15:47 PM »
I assume you have set the Z 0 (zero) as the top of the component. If so your program will run at the top of the component as you don't have a Z minus value in the program stack.
Insert a line immediately after the line that sends the tool to Z 0 with another line of programming telling it to cut into the material
for example
G01 (feed) Z- **(what depth you want) then a feed rate F** (the feed your using for cutting)

Be careful as CNC machines are very unforgiving if you put the wrong values in.

8
General Mach Discussion / Re: Sorry to be a pain again but
« on: January 08, 2017, 12:42:06 PM »
Hi cant open that file, can you save it from the MACH editor as a text file then we can run it on our Mach system to look for errors.

9
General Mach Discussion / Re: Sorry to be a pain again but
« on: January 08, 2017, 10:17:57 AM »
Cold be several things, maybe you have not set the pins for the Z axis, does it move when you jog it?  Have you a Z code in the program to lower the tool into the material eg G00 Z-1 which is rapid down of or G01 Z-1 F20 for feed down. The simulation shows if you are following the path and if you look on the side of the simulation you will see the Z axis move into the material, if it does your program is correct. Can I suggest you post the program list for members to look at as it could be something very simple you are missing.

10
General Mach Discussion / Re: Big trouble
« on: January 07, 2017, 06:40:00 AM »
Have you introduced a new piece of electrical equipment near to your machine. I had a faulty strip light that gave electrical noise that caused strange signal to the computer via the BOB. You could try increasing the de-bounce to 200 in the general config pull down menu that might help if it is electronic noise that's causing the problem.

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