Spindle speed control for SX3...

[compunerdy]

I agree, people are dishing out over $500 to convert the motor and driver. Someone could be making a fortune if they make a driver that could retain the stock motor or a controller for the current driver that interfaces with Mach.

[Al_The_Man]

I am still tinkering with the BLDC motor and drive I inherited, has anyone got info on the LCD display?
It has SMS0324CG but nothing shows up on Google, it appears to be serial data in.
Or any present timing details from the drive?
Al.

[neilw20]

Not even serial data.
Just put in faster pulses and it reads higher.

Can't remember what the frequency/indication is.

Because it is so crude, if you add the high speed pulley mod there is no way, short of a frequency multiplier, to get it to read the correct speed.

If I remember from testing it maxes out 4000 indicated.

That is just another thing that need some smarts.

[Al_The_Man]

Not even serial data.
Just put in faster pulses and it reads higher.

So your saying it is a simple up/down pulse counter?
What about the fwd rev stop indication?
Also it is rather strange for the controller only to switch direction when a start has been issued in the opposite mode?
Al.

[neilw20]

Front panel control.
This is for the EARLY version with the CPU on the front panel pcb and no piggy back board on the MOTOR PCB.
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The later version uses the same display pcb, so I assume signals are the same.
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Pin 9 (front panel) receives tacho signals from the motor PCB.

1 pulses per revolution from hall signal A on motor PCB via CN12 to opto U12 and out pin 9 to the front panel control pcb.

The tacho signal is processed by the front panel CPU and feeds an analogue signal back to the motor PCB via P2 (SV1- pin 6).

The up down buttons operate a digital pot on the front panel PCB creating the P2 signal.

The tapping function puts 5v on the F/R line (SV1-pin 8), as does selecting forward or reverse.

The tapping led is controlled by the front panel PCB.

And that is what happens in manual mode. CNC mode is another stupid story.

[Al_The_Man]

Thanks, I am exploring some possibilities right now during a bit of a lull.
I have never seen it actually on a machine so I am not sure what the Tapping function is supposed to achieve?
This one has the piggy back board with the Atmel CPU.
Al.

[neilw20]

Tapping mode enables buttons (3) on the quill handle to toggle forward/reverse.

Useless due to the unreliable nature of the brush pickup.
OK if quality external button used.

Then when you stop it in reverse, as you do, when you hit start you have to wait for up to speed then reverse it. grrrrrr!!!! Dumb sh1t.
Same with reverse button.

The stupid designer has never used a machine.

[Ozcad]

Hi all just about to embark on a cnc conversion of an SX3 using a Promica kit and Mach3 I would be very interested in any spindle control product