Might be a good touch plate?

Mostly Printed CNC - MPCNC Hardware Development
1

Some of these just showed up with the mail.

I am not sure if I can get a good bulk price or not but they seem promising. 0.53mm thick but it might trigger a little lower, need to actually test that. It takes a tiny bit of pressure to trigger so if you were holding it funky it would push itself down flat for sure. They work well as a switch full open to full close.

Spot is a little over 6mm so 1/4" bits would take good aim.

I tried a point vbit and no damage. Anyone see any issues?

I just see these as clean, no alligator clips or magnets, self contained, no metal tape that gets crinkly and wears out. Expensive but clean?

 

2

You don’t need the white things, and the cable is a lie…it does not come with the one shown.

3

What is the benefits of using expensive piezoelectric touch here instead of usual contact?

Imho i’ts to lightweight to stay flat on a material. Wires will turn it every time. And same time it too small to hold it by finger

 

4

Usual being? I use metal tape and a magnet. Always replacing the tape and any sawdust gets under it so the reads can get tweaked if you are not super careful. This is sealed, and could be wired cleanly.

 

It takes enough pressure to trigger that the bit will push it down before it would trigger if it was up at all. The flat ribbons are nice to hold and can easily keep it in position. It is about the thickness of two overhead transparencies/acetate. It isn’t piezo it is a tiny bare contact gap (sealed).

5

Ok, it’s not piezo. Then it shouldn’t cost $16.

You saw my probe. It’s piece of metal 50x50 mm, it has enough mass to stay at the place where i put it and same time it’s big enough so can hold it by a finger if i want.

[attachment file=81648]

So this little piece of something juts not looks to me as something handy.

You asked about an opinion, that’s it )

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6

I do like the style you have but the others can be had complete for under $2, and maybe less in bulk. That was just the amazon link I used to buy the R&D (quick) testers. With materials any paying someone to solder and crimp your style would cost me way too much. I have a slick version I have been meaning to make for the people that want a fancy one one but this pressure pod might just be a great option.

 

7

Yes, i agree that the device you showed has big advantage - it’s ready to just put it into the kit

8

And your device could be used for 3d printer mode.

Just for note aluexpress full of such cnc probes with price from $2

Disadvantages are it’s too tall and you have to make Dupont connector by yourself.

This is same item for $3 seems has connectors

 

9

Tall ones don’t work for me. I never have that much room above my work. I always shim teh material up as high as possible.

10

I still haven’t done it, but I would expect a metal spatula would be perfect. It would work better if you use a williams sonoma one, I’m sure.

11

Kitchenaid. Their factory is right down the street from me.

12

These are made right down the street to someone:

13

Holy cow! That page looks awful on a 24" monitor!

14

Problem with a spatula is, I don’t think the manufacturer cares what tolerance the thickness of the product is.

Don’t you want the thickness of a touchplate to be exact?

I still don’t use one. I’ve been thinking about making/getting one, I just haven’t done it yet. I just 0 to the top of the board I’m using. Only time it’s an issue is when changing bits… ‘top of board’ can sometimes be .5mm off for some reason.

15

What about a feeler guage or shim stock?

16

I’m using a piece of sheet metal from a pci blank off the back of a desktop. No clue how thick it is, and for the stuff I do, not really worried about it. These are cnc wood routers, the metal stuff is just a happy bonus, but don’t expect super tight tolerances. I don’t think I have anything that could reliably measure the thickness anyway. The digital calipers I picked up from Menards would just give me a good guess. It’s thinner than the finish I’m going to be putting on anything fancy I carve, so close enough!

17

A touch plate would be nice when I’m using V-carve for fine text. I may have to get my learn on.

18

Maybe if you used a touch plate to determine the thickness of the spatula…

Actually, it really won’t be that bad, I hope. If it’s within 0.025mm, I would call that zero. If it’s intentionally sloped, then that would be a problem.