Re: [CAD_CAM_EDM_DRO] servo controllers

Sounds great! When is it expected to be released?
I also wondering if you might know the best way to add
an MPG to EMC?

Thanks
Shawn


--- Original Message ---
From: Jon Elson <elson@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] servo controllers

>Shawncd wrote:
>
>>John,
>>Any idea when EMC will be able to to do lathe

threading?

>>
>>
>>
>No, unfortunately. The HAL (hardware abstraction

layer) changes

>that will produce EMC2 are going along, I believe.

This will allow

>a lot of cleaner connections between motion planning

and whatever

>does the actual motion control. There are some

totally unbelievable

>kluges in EMC now regarding the special cases, such

as homing,

>going into and coming out of E-stop, etc. This

overhaul is much needed,

>and makes all sorts of motion, I/O, etc. into little

well-defined modules,

>with well-documented interfaces, and a language to

connect these

>modules to the outputs and inputs of EMC. I believe

that lathe

>threading will almost drop out of this work, and the

only thing that

>will take some development will be adding the proper

G-code commands

>to EMC's interpreter. I have found the interpreter

to be almost

>incomprehensible, the few times I've peeked into it

looking to see

>how some G-code command turns into the NML message

that actually

>does what was commanded. (I admit, I didn't work

very hard at trying

>to penetrate into the interpreter's workings.)
>
>I hope that I am not being over optimistic about the

HAL and threading,

>but I did see John Kasunich demonstrate electronic

gearing, where he

>twirled an encoder, and a stepper motor responded in

sync with his hand.

>Ths was at the NAMES show this past April.
>This is VERY close to what lathe threading is, just

electronically gearing

>the carriage to the spindle. The only additional

tricks to it are to be

>able
>to sync to the spindle while it is running, and the

break back out of the

>electronic gearing mode after a certain distance is

travelled.

>
>Jon
>
>
>
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