Gallery, Projects and General > Neat Stuff
Micro DRO made from tyre tread depth gauge
John-Som:
Life has become simpler. In providing a battery free supply for DRO systems commonly fitted to X2 mills it's worth pointing out that the need to provide both 3v (for the remote read out) and 1.5v (for the read head) power supplies can be avoided if read heads from digital tyre depth indicators can be utilised as these operate on 3v.
So, unless I am very much mistaken, all you would need is an adjustable power supply unit set at 3v feeding both the remote DRO and the read head. This would make my battery free power supply unit obsolete - such is progress.
John-Som
kd0afk:
Anyone know what the shiny stuff is on the slider? If one had a longer piece of it it would read longer than 1 inch. Also, is the thing under the tiny cover a data port, if so with what and how do you use it?
ksor:
>> kd0afk
Just read the thread ... the answer to ALL your Qs is there ! :coffee:
kd0afk:
--- Quote from: ksor on October 07, 2012, 02:37:23 AM --->> kd0afk
Just read the thread ... the answer to ALL your Qs is there ! :coffee:
--- End quote ---
99% of this thread is "I got mine today" and "where do you get one?" but I did get the entire thread read and while it answered a lot of but not all my questions. I got the links answering the data port question but the question about the shiny layer needs closure. Is it a sticker, a textured strip of metal? Does it need a uniform texture to read accurately? Could a person have a strip of SS media blasted or etched to make it more accurate?
I can see real potential in this system with the AC power system and remote readout. Add a strip of "C" channel to keep the svarf out and I think it would be a great tool. You might be able to purchase a DRO system for the same money or less than the final cost of the project but it wouldn't have the satisfaction factor of a DIY.
PekkaNF:
I believe this application is some kind of copy magnascale:
http://www.mgscale.com/mgs/language/english/product/Magnescale.html
Inductive or capacitive. I have worked with sony magnascales and these looks like stainless steel tape, but really should not be heated, stretched, kinkked, welded nearby or anything that stupid.
There are many same type of copies available, I know this one:
http://www.machine-dro.co.uk/digital-readout-systems/magnetic-tape-linear-encoders.html
The cheap tyrecauges and calibers probably have "sticker tape" next to read head. Probably best used as it is. Might be difficult to duplicate or improve at typical home workshop.
Pekka
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