Messages

8361

Show"N"Tell ( What you have made with your CNC machine.) / An unusual application for Mach ?.

« on: December 12, 2009, 08:17:07 AM »

Do you remember these (legacy) magnetic access cards ?.

Well I needed to program one – they have a composite core of  flexible magnetic material (very similar to a fridge adornment) and are programmed with a number of magnetic domains, some north up and some north down. Knowing the positions and polarities of the required domains do I make a ‘programmer’ or use Mach ?.  You guessed it Mach wins.

I used a 110Volt coil, half wave rectified, together with a couple of bits of iron and with the spindle relay (and the use of M3 / M4 commands) was able the change the magnetic polarity of the coil to program the domains.

It worked perfectly and serves to indicate the versatility of Mach for what is perhaps an unusual application.

Tweakie.

8362

General Mach Discussion / Re: motor tuning menu wierd in machmill need a good XML file

« on: December 10, 2009, 08:01:31 AM »

Have you tried setting Sherline 1/2 pulse mode in Ports and Pins ?.

Tweakie.

8363

General Mach Discussion / Re: Z axis problems

« on: December 10, 2009, 07:57:14 AM »

Hi BarryM,

You touch the cutter on the surface of the work then zero the Z axis DRO. Then raise the z axis (cutter) clear of the work before clicking on Start.

Tweakie.

8364

General Mach Discussion / Re: router tips burning

« on: December 08, 2009, 03:12:30 AM »

The problem here is heat which is generated by friction.
The low cost bits are made from tool steel (if you are lucky) and will not stand overheating whereas the more expensive carbide bits stand a much better chance of survival.
Cutting bits have side and face clearance which reduces the area in contact with the work and thus quite low friction (heat) is generated but if the cutter flutes become choked with the cuttings then the friction increases at an alarming rate and will ultimately lead to tool failure for all but perhaps the extremely expensive cobalt alloy tools (stellite) which will carry on and just burn their way through.
Using an air jet, aimed at the tip of the tool, will clear these cuttings from the cutter and kerf as well as providing a measure of tool cooling. Shop air, run through a pressure regulator, is just fine for this task.
I have found the single flute carbide cutters to be best for both for wood and plastics as the face and side clearance is much greater than with multi fluted tools. Cuttings don’t get trapped in these tools and so little frictional heating occurs but the low pressure air jet is still desirable. The cutter on the right of this picture is a single flute type and shows the exaggerated side and face clearance quite well.

Tweakie.

8365

General Mach Discussion / Re: ground wiring question

« on: December 07, 2009, 01:58:41 AM »

Barry,

In an ideal situation you would have all your ground wires, screens etc running to a single point ground (to avoid ground loops and possible noise pickup). In reality it is not quite as simple as that but it is what you should aim for.

Tweakie.

8366

Show"N"Tell ( What you have made with your CNC machine.) / Re: M1 MILLING MODEL

« on: December 07, 2009, 01:50:53 AM »

Excellent work Rich.

Tweakie.

8367

Show"N"Tell ( What you have made with your CNC machine.) / Re: A Short Video.

« on: December 06, 2009, 04:13:57 AM »

You are way ahead of me Sam, I didn't know what it was until I was 10 Years old !!!. 

Tweakie.

8368

Show"N"Tell ( What you have made with your CNC machine.) / A Short Video.

« on: December 05, 2009, 11:59:32 AM »

Just a bit of fun really, but I decided to make a couple of short videos to put on my website. The hardest part was adjusting the feedrate so that the job took the same length of time as the musical score.
This one is a bit better than my first video but I think that more practice is needed.

                   http://www.tweakie.byethost.com/engrave1.wmv

Tweakie.

8369

General Mach Discussion / Re: plasma mach motor tuning

« on: December 02, 2009, 12:21:47 PM »

Try reloading Mach again -  it could be that the driver file has not loaded correctly.

Tweakie.

8370

Tangent Corner / Your Christmas Wish List.

« on: December 02, 2009, 04:14:57 AM »

Hey Guys & Galls,

Christmas is almost here and Santa will be browsing this forum looking for stuff to get for you.

To avoid disappointment or risk getting stuff you don't need please post your Christmas Wish List here.

Hurry, because Santa is very busy this time of year and you don't want to miss out now do you.

For my part, I wish a Very Merry Christmas, Peace and Good Fortune to you all.

Tweakie.

ps. A 1.5mm carbide tipped ball nose would be nice.