TouchDRO on a mini lathe

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modeldozer:
Screening and supresion is one of the reasons I have used USB cables, ready made with connectors and decently priced. You will also note in the schematic there are 3 different supply filtering capacitors for each scale plus the 100nf soldered directly accross the scale supply input. My shop is full of electrical noise and so far the system is working perfecty.

Abraham

BaronJ:

--- Quote from: Joules on December 26, 2014, 07:15:06 AM ---Baron,
wrap it in tin foil till you get round to fixing it, or strip a length of coax, bunch the braid slide it over you cable and stretch it back out. Good temporary fix The turkey fat will keep the foil on your cable :lol:

:wave:

--- End quote ---

Good Idea Joules
I've loads of old co-ax... :doh:
Thanks:

BaronJ:

--- Quote from: modeldozer on December 26, 2014, 09:51:43 AM ---Screening and suppression is one of the reasons I have used USB cables, ready made with connectors and decently priced. You will also note in the schematic there are 3 different supply filtering capacitors for each scale plus the 100nf soldered directly across the scale supply input. My shop is full of electrical noise and so far the system is working perfectly.

Abraham

--- End quote ---

Hi Abraham,
I had noticed that you seemed to have a lot of decoupling in there, and I can understand why. In my case it seems that the mill motor is the culprit. When the load on the motor rises the commutator sparks more and that seems to be when the readout fails. The spindle speed display often plays up as well, which is not surprising since it is in the same box as the rest of the electronics.

PS. Have you thought about making some PCB's for sale ? I reckon that you have a winner there.

modeldozer:
Hi Baron,

I will have to look into making the boards as my current setup is more geared to one of's. The Eagle files are availeble to anyone interested in making the board.

Abraham.

Arbalist:
My first Digital caliper was a Mitutoyo unit and when I bought a cheap caliper to leave in the workshop I noticed that it didn't immediately display the measurement in the same way as the Mitutoyo. In other words there is a slight delay between movement and display. Is this the same on the scales illustrated earlier and is it noticeable on your readout? If it were to the same degree as the cheap calipers I've bought I'd expect to either move the table on my mill more slowly or expect to have to "go back" after over shooting the mark so to speak.

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