Thanks for the help John, now all I need to do is get emc II up and
running on my machine :-)
Andy
John Kasunich wrote:
Andy Holcomb wrote:
http://littlemachineshop.com/products/product_view.php?ProductID=2938
Yes.
Can EMC II use a jog wheel yet?
If so what is required?
A jog wheel. The ability to count the pulses it makes. Hardware pins
to get the pulses into the system. A few lines of HAL code to hook it up.
The wheel you linked to has 40 counts per rev which is typical.
Assuming you aren't going to spin it faster than 10 revs per second,
that works out to a maximum of 4000 counts per cycle. EMC2 can easily
count that speed in software. (The limit is probably more than twice
that, even on a slow PC.) So all you need is two free general purpose
digital input pins. Parport pins work fine, as do extra inputs from
motenc or mesa cards, or a variety of other general digital input cards
(8255 based, etc).
The Pico systems boards (USC and UPC) have opto-22 modules on most of
their I/O, which isn't good for encoder signals. However, those boards
have 4 encoder channels. If you have a three axis mill, or a 2 axis
lathe with spindle encoder, you should still have an encoder channel
free to count the jog wheel. Using a hardware counter to count 4000
counts per second is overkill, but if its there, might as well use it.
You can do a variety of things with the jogwheel. AXIS provides HAL
pins that can be used to make the wheel control whatever axis is
selected in the GUI. I'm not sure if the other GUIs can do that or not.
You can also select the axis to jog using onscreen buttons with pyVCP,
or real buttons and/or selector switches. You can also select different
scale factors, again with onscreen buttons or real ones. For example,
you could select between 1.000 inch per rev (0.010 per click) and 0.01
inch per rev (0.0001 per click).
If you rich and have three wheels, you can hook one to each axis
permanently.
Regards,
John Kasunich
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