Rigid tapping encoder pulse

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Rigid tapping encoder pulse

Postby Battwell » Fri Jul 20, 2018 12:18 pm

At the moment I have 10000 count encoder step/ direction servo spindle set up
To get a reliable actual speed reading I had to half the counts of ab back to uccnc ab channel (3500 rpm)
I have z pulse also from the encoder- into index input.
The z pulse isn’t gated with ab so raw 1/10000 at the moment .
Re rigid tapping that is going to be at low rpm. Is this pulse likely to be long enough?
By the way -it’s tracking speed superbly now
https://youtu.be/IuCULDcxZ_Q
Uc300eth on router and mill.
UK uccnc powered machine sales. https://cncrouter.uk/atc-cnc-routers.htm
Automateanything/duzzit cnc/mercury cnc
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Re: Rigid tapping encoder pulse

Postby Battwell » Fri Jul 20, 2018 2:28 pm

The answer was no - even though I could see the z pulse on break out board it just sits waiting.
Got it going using original spindle sensor.
https://youtu.be/eD8rGgB8xN4
Uc300eth on router and mill.
UK uccnc powered machine sales. https://cncrouter.uk/atc-cnc-routers.htm
Automateanything/duzzit cnc/mercury cnc
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Re: Rigid tapping encoder pulse

Postby cncdrive » Fri Jul 20, 2018 3:06 pm

What about making a simple pulse extender circuit?
Like this: http://www.555-timer-circuits.com/monostable-555.html
Or making one with a microcontroller or Arduino etc.
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Re: Rigid tapping encoder pulse

Postby Battwell » Fri Jul 20, 2018 3:23 pm

ive tested it up to 1000 rpm on the original npn spindle index sensor- and its ok.
i had to half the ab encoder signal output (from 2500 line to 1250 line) otherwise it wasnt reading the correct speed at max rpm of 3500 rpm.. i did this with a divider in the drive.
same with steps per rotation in- or i couldnt get the 3500 rpm- even at 400khz kernel @2500 lines per rev. had to drop to 1250 lines/rev.
so for now- im happy enough. ive left it running for the last 2 hours- seems ok.
(i have a customer waiting for the machine ) but a lot of testing and tidying up to do first.
re rigid tapping- its not something ive ever done myself before. had to refer to the manual to learn to code it. haha!
Uc300eth on router and mill.
UK uccnc powered machine sales. https://cncrouter.uk/atc-cnc-routers.htm
Automateanything/duzzit cnc/mercury cnc
Battwell
 
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Re: Rigid tapping encoder pulse

Postby spumco » Fri Jul 20, 2018 9:00 pm

I have an index pulse triggered by an NPN proxy (plastic collar with steel set screw in collar). Completely separate from the motor encoder as I'm not runing a 1:1 belt ratio.

Works like magic for initiating the synchronized spindle (tapping) if you can't get your encoder Z pulse working right. Peck taps all day long at 1kRPM and no buggered threads.
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Re: Rigid tapping encoder pulse

Postby Battwell » Fri Jul 20, 2018 9:43 pm

That’s the original setup except its 1:1 ratio
I’m using that for my index pulse now.
Left it on test for about 3 hours - ok
Uc300eth on router and mill.
UK uccnc powered machine sales. https://cncrouter.uk/atc-cnc-routers.htm
Automateanything/duzzit cnc/mercury cnc
Battwell
 
Posts: 821
Joined: Sun Sep 25, 2016 7:39 pm
Location: South Wales. Uk


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