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Messages - mbele

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31
General Mach Discussion / Re: Odd behavior with probe wiring
« on: May 04, 2014, 08:51:06 AM »
I find that odd, I only had problems with noise with grounded PCB, +5V on tool and active-high circuit logic. Have you tried connecting capacitor (ceramic 0.1uF) between input and ground ?

32
General Mach Discussion / Re: Odd behavior with probe wiring
« on: May 04, 2014, 06:31:01 AM »
Here's how it works for me (I think I have c10, too):
- my router is grounded (it seems that yours is too), so I do not have to ground the tool with aligator clip wired to breakout board ground
- PCB is connected to breakout board input
- the same input is connected to +5V (right next to input) via resistor (2k2 1/4W i think), so that normaly, open circuit is "high" signal state
- when tool touches PCB, it grounds probe input (brings it "low")
- mach is configured so that open circuit is "high", and closed "low" (Active low)
HTH
Mihael

33
General Mach Discussion / Re: probe guard
« on: May 04, 2014, 06:10:49 AM »
Offcourse! Are you going to disable motor movement at breakout board ?

34
IIRC, all expressions should be enclosed in square brackets:
N21 G00 A[#3+[#14*#13]] Y[#2+[#14*#12]]         (RAPID RAISE Y-A TO CORRECT START HEIGHTS)

35
Hi, in line 10, command should be G0 (zero not O) :)

36
Stirling, thank you, for the kind words and great info. I'm sorry I missunderstood and missquoted you, probably causing confusion.

37
I made spring loaded touch plate just a few weeks ago and it was a big improvement over fixed touchplate for me.

Before that I've been using fixed PCB touch plate connected via switch to estop input, so my machine would stop as rapid as it could when the plate was touched. Then I would isolate the plate from estop with a switch, reset Mach, and manualy enter Z offset. In that scenario feed(v) can be calculated if max overtravel(s) and acceleration(a) are known: v=sqrt(2as). Actually, i'm pretty sure that motors decelerate faster in case of e-stop, and machine position is lost by some number of steps (depending on the feed rate), but it worked OK, especially because PCB material is relatively soft.
In my example, a=2000mm/s^2, s=0.0125mm (one microstep), v=sqrt(2*2000*0.0125)=~7mm/s=420mm/min

Spring loaded brass plate is housed in POM-C case (since my machine is made of metal and it's grounded), connected to probe input, and it works on the same principle of closing electrical circuit (instead of using microswitch). Spring allows plate to travel a few mm, which allows Mach3 to decelerate (and sleep while isMoving()) when the probe signal is activated. Then the tool retracts rapid to touch position, and then retracts slowly step-by-step until electrical connection has been broken for at least second and a half. It's very acurate and I haven't broken any endmills/tips yet. I will share the script if you want, it's based on the script found on this forum.

Now, stirling got me worried about accuracy/unpredictability of trip point:
Quote
2) Perhaps worse though is that because its attempt to store the stop point may well fail, the retraction will be pretty random/un-predictable and in worst case could seriously crunch your tool tip/plate.
so I'll make rapid retract conditional in respect to current tool position.



38
General Mach Discussion / Re: Testing salvaged AC servos
« on: April 22, 2014, 03:31:08 PM »
garyhlucas, i figured that much, and that's exactly what I did, just a fuse and a switch - all good :) Thank you.

39
General Mach Discussion / Re: Testing salvaged AC servos
« on: April 22, 2014, 01:13:51 PM »
John, thank you for your reply and concern. I've never worked with servos, so I'm a bit insecure.

40
General Mach Discussion / Testing salvaged AC servos
« on: April 22, 2014, 09:45:10 AM »
Hello

I've salvaged some parts from 2 inkjet printers:
1.
Fuji Faldic-w driver RYC201DC3 VVT2 + motor GYS201DC2 T2C w/ 17bit encoder (200W, input 200-230V@3.4A)
Fotek SSR-25 DA (25A/250V) input:3-32VDC, output: 24-380VAC
2.
Panasonic Minas driver MSDA043A1A + motor MSMA042A1G w/ 2500 P/r encoder (400W, input 200-230V@1.8A)
Delta Electronics 20DBAG5 EMI filter (250V/20A 250V/16AHPF)
Delta Electronics 06GEEG3E line filter (6A)

I'd like to test if they work, but I'm not sure if I should power them on without other required components in the power supply chain.
Fuji requires circuit breaker/Earth leakage circuit breaker, AC reactor and power filter. Panasonic requires "Non-Fuse Breaker" (probably simple automatic circuit breaker), noise filter, magnetic contactor (probably relay), and reactor. I've found all the missing components on ebay, but price is too high if it turns out that motors/drives do not work.

Can I connect drives directly to 220V AC power supply, and check if they work without burning them?

Thanks
Mihael


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