Peter, I always enjoy your videos so thank you. Something worth noting with freewheeling or snubber diodes is that they always delay the release of the relay slightly by providing a path for the current to keep flowing through the relay coil. The length of the delay depends on relay characteristics. In most situations the delayed release is of no concern as it is only milliseconds or low tens of milliseconds. Where the time delay is a concern there are other options for more complex snubber circuits. A couple of other things also worth noting: 1. Some relays have a diode built in across the coil. If the relay coil terminals are marked with a polarity sign that is a clue that there may be a built in diode. 2. The same back EMF problem can exist in circuits with ac relay coils but of course freewheeling diodes can't be used. Other resistor-capacitor or transient suppressor snubber circuits are generally used, if any at all are fitted. The severity of the problem in an ac circuit depends at what point in the ac wave the relay coil circuit is interrupted.
@practicemakesbetter7132
2 жыл бұрын
Welcome back Peter, nice to hear from you again!
@cncnutz
2 жыл бұрын
Thanks
@IH1940HAY
2 жыл бұрын
Thanks so much Peter, I so rely on technical experts like you to keep me on the up and up.
@pwrouzaud
2 жыл бұрын
Knowing a tiny bit of Greek, I was able to pick up enough to understand why so many of these diodes are included in electronics. Before your instruction I had no idea! BTW, this is why one should start learning a language early in life. Count me among the number who are pleased you have returned to youtube. Thanks for the vid.
@cncnutz
2 жыл бұрын
Thanks Peter
@daveblackburn7844
2 жыл бұрын
Thank You Peter as always I really appreciate your videos WELCOME BACK!!!
@cncnutz
2 жыл бұрын
Thanks Dave
@rorymccann9198
2 жыл бұрын
Great to see you Peter,, love watching your channel
@cncnutz
2 жыл бұрын
Thanks Rory
@jenibond
2 жыл бұрын
Nice to see you back (some time's life get in the way of youtube ) Would love to see how your Cnc upgrades turn out as you were great help with my redesign of my own machine even if mines a bit different you gave me some great tips love jen xxxx
@cncnutz
2 жыл бұрын
Thanks Jenifer. I am trying to get a laser install out but keep getting side tracked. Cheers Peter
@winandd8649
Жыл бұрын
Thanks Peter! I'm having troubles with exactly this, My spindle is activated via a relay and something mid job, the relay releases causing the spindle to stop spinning.. ruing my work and the cutter :-( So I've been turning my spindle on manualy for a while, but I will look into this tip! 👍
@cncdavenz
2 жыл бұрын
8 months since your last video Peter. You must have been having lots of fun with your upgraded router. I am in the process of converting a cheep wood lathe to CNC using Mach3. I hope you and yours have a good Christmas and New Zealand can stay at orange or maybe green. Cheers Dave (now living in Dannevirke)
@Paulman50
2 жыл бұрын
Orange is guest leval 2 with a new name
@cncnutz
2 жыл бұрын
Thanks Dave. I'd like to make a lathe one day.
@Mr_Wh1
2 жыл бұрын
Good to see you Peter.
@stripples2
2 жыл бұрын
Yes! Welcome back .
@cncnutz
2 жыл бұрын
Thanks stripples2
@U_Kamrc
2 жыл бұрын
Glad to see you are back! May I ask which oscilloscope are you using? I propose another type of diode: "fast recovery" for higher voltages or "Schottky" for up to 24VDC supply.
@cncnutz
2 жыл бұрын
I real cheap one off Aliexpress made by Fnirsi 1014D. There are better ones available for the same money. I would not recommend it. Cheers Peter
@Paulman50
2 жыл бұрын
Good to see you back Peter. Great idea, I get emf shocks of air valves regularly, will try that for sure. What is the best distance per revolution for X & Y axes. I'm just getting round to finish building the cnc machine that was started over a year ago. Going to belt drive the screws. ( cheep 2mm pitch stainless steel).
@cncnutz
2 жыл бұрын
If you are getting shocks you definitely need to install a diode across the solenoids. Resolution will depend on your machine size and what you are machining but I am happy with 0.01mm per step on the X & Y and 0.0025mm per step on the Z. In general Micro stepping between 2 and 10 times is reasonable and more that that is wishful thinking. With such a fine screw if I was direct driving it I wouldn't go more than 4X and I would probably go 2x but that is my personal opinion. Cheers Peter
@Paulman50
2 жыл бұрын
@@cncnutz thanks, after watching your ball screw versus rack video I have decided to gear drive on to my 2mm pitch threaded rod at a ratio of 1:2. A bit of both ideas, thanks for your help.
@DaveGatton
2 жыл бұрын
I just came here to see Chip. Hahaha. Just kidding buddy. Glad to see you are doing well and hope to see more videos from you soon. 😀
@cncnutz
2 жыл бұрын
Thanks Dave
@rmp3499
2 жыл бұрын
I have back EMF problems not related to solenoids or relays. Router system pauses for a few seconds then continues. This happens every couple of minutes when running a a gcode program. Very annoying. The only thing I could think of is to wrap all the wiring with shielding tape. This helps a little but not completely. Sometimes the USB breakout board stops working. Rebooting the computer usually works.
@mohamedsoud
2 жыл бұрын
had similar problem in the past and missed around my cnc for a while till I got fixed and work properly check your grounding your frame and spindle and electronics should be grounded to a single ground point. if youre not using sheilded cables use them and ground them as well to the single grounding point. use ferrite clips on your wires lastly if all doesn't work try to get a different controller from a friend and test if using it solves your problems, I had NVUM V2 and its a piece of crap, I'm so glad it kicked out the bucket and bought Wixhc mk5 which is 100 times better than the nvum
@cncnutz
2 жыл бұрын
I agree with Mohamad. It sounds like you have noise issues. Cheers Peter
@kinghong1970
2 жыл бұрын
Peter, always loved your videos! in regard to the Back EMF, should we be concerned about this on the MASSO relay board as well? or are the diodes built in to them? thanks in advance!
@cncnutz
2 жыл бұрын
The diodes are built in on the MASSO TTL relay module. I am specifically referring to switching inductive loads using the relay contacts. Cheers Peter
@bobannikoloski7941
2 жыл бұрын
My machine somethimes is doing different contour with the same program...in that time, the servo motors on X,Y axis are shaking. Maybe this will fix the problem?
@cncnutz
2 жыл бұрын
To be honest it does not sound likely. my feeling is your servos are not properly tuned if they are unable to hold a stable position but that is a guess at best. Cheers Peter
@bobannikoloski7941
2 жыл бұрын
@@cncnutz Thanks for the unswer. But, there is monts when ewerithing is perfekt, and suddenly there is problem, as I describe.
@chrisbailey4696
2 жыл бұрын
Those hairs coming out your nose are really annoying.That's all I can see now?
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