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561  Mach Discussion / Mach Screens / Arrow Keys Jogging doesn't work with a new screen on: July 03, 2011, 12:46:30 PM
Hi,

I have created a new screen using MachScreen. I took the standard mill screen set and deleted all the pages accept diags and settings. Then I created another page that would be the main page for all stuff. The main screen is designed for a touch screen with and has large buttons.

It seems to work fine except for several things which I can't figure their relation to a specific screen:

1. I define arrow keys to jog from the keyboard, but they just don't work. Simply loading the standard screen fixes it.
2. Some commands don't work from the MDI - G1's work fine while G0s not.
3. I have job buttons on the screen (which is a touch screen), but pressing them the axes would only jog some distance (which is not constant, but very close to such) and then just stop - feels like jogging is set to incremental, while it's not.

Any ideas why would any of these happen?

Thanks,
Dan
562  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: June 17, 2011, 01:05:53 AM
Super precision angular bearings are very expensive. If you say $50 each that doesn't sound like a super precision bearing. So here you go:

http://bearingsdirect.com/

http://www.vxb.com/

http://arceurotrade.co.uk/Catalogue/Bearings/Angular-Contact-Ball-Bearings   (in the UK and doesn't have your size, but otherwise good pricing)

Dan
563  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: June 15, 2011, 02:01:51 PM
Katoh,

If you ask me, 20mm is definitely overkill for this machine. Keep in mind that the ball nut will be huge - the mounting flange being some 50mm in diameter. A 16mm diameter will have plenty strength for this machine. Even a 10mm one will cope well with those loads, but a 16mm one will not even "feel" the them Wink

Dan
564  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: June 14, 2011, 07:28:47 AM
Not quite so. Lead screws can be very accurate. Not sure what are the numbers you measured. It is common to speak of a ball screw in terms of accuracy over a given length. Thus, for instance, a C5 accuracy grade would mean about 0.03mm acceptable error in travel over 300mm. Accuracy grade definition varies from one manufacturer to another, so the above example is not dictated by a standard.

Lead screws can easily hold those accuracies. So, when using ball screws it's not really an accuracy demand. Ball screws allow you to have minimal backlash (practical zero), which is often desired in a CNC application. Also, ball screws run quieter and higher speeds can be achieved without the risk of heating the nut and wearing it. Of course they wear slower. Theoretically you can have a lead screw set up to have zero backlash, but it will hardly last.

Dan

EDIT:

Forgot your lathe was Chinese, so the original screws may have been poor quality and not as accurate Wink
565  General CNC Chat / Show"N"Tell ( Your Machines) / Re: AL54b (lathe) project from New Zealand on: June 10, 2011, 12:58:41 AM
Isn't it so much rewarding to finally see it in action Smiley

I like the G251 - it almost makes steppers sound like servos. Still not on all speeds though.

Dan
566  Mach Discussion / Machscreen Screen Designer / Re: MachScreen releases on: May 25, 2011, 10:44:50 AM
Thank you, Klaus!

Dan
567  Mach Discussion / Machscreen Screen Designer / Re: MachScreen releases on: May 21, 2011, 02:26:05 AM
Great!!

Dan
568  Mach Discussion / Machscreen Screen Designer / Re: MachScreen releases on: May 21, 2011, 02:09:38 AM
Hi Klaus,

We have just found with Hood that there is something that can be very useful which can be done in Screen4 but not in MachScreen. In Screen4 one can force leading zeros by using a formatting string something like this %04.0f. MachScreen on the other hand, doesn't output leading zeros with the same formatting string.

Also, using a formatting string like T%04.0f is allowed in Screen4 and and will output the T in front of the number. This is useful in some cases, like the one demonstrated by Hood, here:

http://www.machsupport.com/forum/index.php/topic,17093.msg127574.html#msg127574

Please consider adding these capabilities to MachScreen.

Thank you for your efforts and a great software!

Dan
569  Tangent Corner / Bargain Basement / Re: Back Covers For Stepper Motors on: May 18, 2011, 08:22:39 AM
Hi Peter,

That looks neat! Thanks for posting it.

Dan
570  General CNC Chat / Show"N"Tell ( Your Machines) / Re: The Laser Project. on: May 15, 2011, 02:37:11 AM
Amazing!

Dan
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