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Messages - joeaverage

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1991
Hi,
as Chinglish goes that manual is atrocious!

The settings you should look at are PA34, PA 35 if you wish to set a torque limit under ALL circumstances
or PA36 and PA37 if you wish the limit to apply ONLY at those times when you excite an external signal.

Craig

1992
Hi,
either <Stop> or <Estop> do not de-accelerate, they crash stop.

There is settings within your servo drive that limit current, or analogously torque, which will be a bit more graceful.

If you make this setting just a little more aggressive than the max acceleration you have set Mach to then it will not interfere
with normal operations but will effectively provide a max de-acceleration slightly in excess of that.

Craig

1993
Hi,

Quote
Also am I correct in assuming the mb3 that you mentioned wont work with the THC without a bunch of extra wiring?

No, the THC will work, better in fact, with the presence of a breakout board.

Craig

1994
Hi,

Quote
Joe, pardon my ignorance but do I really need a bob and why? If I have ribbon cable cant I just go from the ESS/thc to the stepper drivers?

Yes, you can go direct from the ESS to the stepper drivers if you wish.....but the slightest hiccup in your wiring and you blow the ESS.
A BoB provides an easier and more secure means of attaching wires to drivers, switches etc and buffering that will go some way to
protecting the ESS.

Quote
I am very familiar with relays and micro controllers 5v relays are pretty easy to get now with the pi being around. I actually have several realy boards with 8 to 16 relays on them that are 5v signal controlled.

As I said, 5V relays are available, less readily than 24V relays however. Also if you are restricted to the output current of the ESS,
supposedly 20mA, but you would be advised to stress the ESS less by demanding 5mA or less, then the relays are small
and therefore unlikely to be able to handle significant current.

By all means use the ESS without a BoB but when you blow it up.....no whining or moaning....you were warned.

Craig

1995
Hi,
I see you have not allowed for a breakout board/boards. While all the smart motion control stuff happens in the ESS
a breakout board allows you to match the ESS inputs and outputs to real world components.

A common example would be  a 24V relay to turn on a blower. 24VDC is very VERY widely used in industrial practice
and as a consequence the range of 24V parts, like relays, lights etc is very extensive. On the other hand 5V relays with
sensitive coils that could be operated by the low currents available direct from an ESS are available but rare.

Simple C10s ($23 each) are birectional so can be adapted to any one port (of three) of an ESS. Note that they are still
only 5V boards, they have a TTL buffer good to about 20mA only. Note also that they do not have any relays or a PWM
to analogue circuit nor do they have any opto-isolated inputs. If you need these features you need to add the extra
few electronic components to effect them.  They are cheap and flexible if you are  prepared to add the extra bits.

If you are not inclined to add extra circuitry you might look at an MB03 from CNCRoom ($180). All three ESS ports are
developed/exploited with a range of inputs and outputs and a variety of signaling arrangements (single ended, differential,
opto-isolated etc). Naturally you will have to conform to the choices the manufacturer made but all in all its a well thought
out and executed breakout board.

You should allow for a bottle or two of whiskey to calm the nerves when wiring it all up!

Craig

1996
Hi,
this approach will, as Graham suggested, put the lathe tool either under or over the centre line throughout the toolpath.
Depending on the material that may be a problem which could only be cured by having the Y height
move  synchronously.

Craig

1997
Hi Azalin,
as an example if the eccentric diameter is 50mm and its is displaced 10mm from the lathe centre:
r=50
d=10

With the spindle at 30 degrees theta =300
r'=(502-102sin230)1/2-10.cos(30)
   =(2500-100x0.25)1/2 -10x0.8660
   =49.749-8.660
   =41.089mm

Now if the lathe spindle rotates another degree so theta=31
r'=(2500-100x0.2652)1/2-10X0.8571
    =41.165mm

The Gcode that would link these two steps is:
g1 x41.089 c30
g1 x41.165 c31

This is clearly too painfully slow to calculate by hand so that's what Lua is for. Note I would calculate (using a Lua script) every 0.1 degree
or maybe even finer, thus I would use a macro as a sort of Wizard.

Craig

1998
Hi,
whoops....my attached pic is upside down....this attachment may be easier to read.

Craig

1999
Hi,
stick with me here...this may take a couple of posts to flesh out.

I have attached a pic of an eccentric circle of radius r with its centre displaced from the rotational centre of the lathe
by a distance d. As the job rotates (increasing theta) the centre of the eccentric describes a circle with components:
x'=d cos(theta)
y'=d sin(theta)

According to the diagram we require the distance r' from the lathe tip to the lathe centre as a function of theta.

r'=(r2-d2sin2(theta))1/2 -d cos(theta)

All that is neccessary is to generate gcode moves at sufficiently fine intervals of increasing theta.

Will come back with some details.

Craig

2000
Mach4 General Discussion / Re: How to mark an axis as "Homed"
« on: October 07, 2019, 12:59:29 AM »
Hi,
I rather suspect that Mach4 is continuing in the existing homing mode, that you have changed mode has not yet taken effect.

If memory serves there is an API that causes Mach to re-read the .ini file, and then and only then does the change take effect.

I'm due out the door in minutes to play bridge but would otherwise explore this further.

Craig

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