Etching Machine Wiring Schematic

logem

logem

Joined
Nov 23, 2003
Messages
773
I thought that this may help some of you who are trying to make the etching machine that is described on Chris Crawford's site. I believe Bob Warner was the designer.

Here's a schematic that I created. I thought that it may help some of you visualize the connections a little better.

PDF File HERE

Mike L.
 
Great looking pdf! This should be a great help to anyone making one of these!
 
Thanks. I figured I had it, but that makes it certain. Have everything, but a box, and I will form that next week at work and my stencils are on the way.
 
I revised the schematic to correct several problems:

1) I noticed that the hand pad and alligator clip wires were backwards. The alligator clip should be DC(+) when etching, and the hand pad should be DC(-).

2) I was burning holes in my stencils with 24 volts. So I used the center tap on the transfomer to reduce the circuit to 12 volts. It takes about a minute longer to etch, but your stencils will last longer. If you want 24 volts, connect the un-used transformer wire instead of the center tap, then tape off the center tap.

I'm sorry about any inconvenience that may have been caused by the incorrect schematic.

Mike L.
 
Thanks for the update. I will change my leads around and add a switch with a lead from a 24 v tap and the center tap so I can switch from 12v to 24v
 
logem said:
I revised the schematic to correct several problems:

1) I noticed that the hand pad and alligator clip wires were backwards. The alligator clip should be DC(+) when etching, and the hand pad should be DC(-).

2) I was burning holes in my stencils with 24 volts. So I used the center tap on the transfomer to reduce the circuit to 12 volts. It takes about a minute longer to etch, but your stencils will last longer. If you want 24 volts, connect the un-used transformer wire instead of the center tap, then tape off the center tap.

I'm sorry about any inconvenience that may have been caused by the incorrect schematic.

Mike L.
Click to expand...

That's funny. I just logged in to say I built the etcher tonight and it works great except the polarity is wrong on the output leads.

Mike, thank you for the schematic it made the project a cinch.

-Ben
 
Logem,
You show a LED for a pilot light across the 120v AC line. LEDs are low voltage DC devices. One must make sure that the light they use is designed for 120v, AC operation.

I also have diagrams that many have found usefull, it is the same circuit but geared for the more practically orientated.

Link

http://atfabcrafts.tripod.com/photos/

Polock
 
Polock,

The light is actually a 120V neon light from Radio Shack (P/N 272-712).

Good observation. I'll change the notation on the diagram accordingly.

Mike LoGiudice
 
Well I disconnected one of the 24v lines from the transformer and took the leads that went to it and connected them an outer tap of a spdt sw. I then ran a lead from the 12v transformer tap to the other outer tap on the sw. Then I went from the sw center tap to the leg of the bridge rectifier and the leg of the ac/dc switch that had the leads to the 24v tap I disconnected. I can now switch from 24v to 12v. The unit works great and did a wonderful job of etching my name with a TUS stencil.
 
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