Handwheel revolution counter

Hi,
I would like to rig up a low tech, cheap handwheel counter for my
manual milling machine. I'm picturing a three or four digit counter
that looks like an odometer and can be reset with the push of a
button. With each turn of the handwheel something on the handwheel
hits the counter and increases it by one. I don't know what these
parts would actually be called or where they could be purchased. Any
ideas?
Thanks,
Peter
Reply to
Peter Michaux
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On 8 Dec 2003 14:36:16 -0800, Peter Michaux put forth the notion that...
Just a trip-action counter? Try eBay first, then McMaster-Carr:
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Checkmate
I must have only seen those at surplus stores for less than five bucks about 300 times. How hard have you looked? - GWE
Peter Michaux wrote:
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Grant Erwin
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Jim Stewart
On 8 Dec 2003 14:36:16 -0800, snipped-for-privacy@yahoo.com (Peter Michaux) brought forth from the murky depths:
I've seen the little chromed manual counters available on Ebay for several dollars. Ticket takers use them to count heads of cattle going into places like fairs. Rig one up with a long paddle and install a too-long roll pin in the handwheel to actuate it. That would be 1-way only.
-- Sex is Evil, Evil is Sin, Sin is Forgiven. Gee, ain't religion GREAT? ---------------------------------------------
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Reply to
Larry Jaques
A lot of surplus dealers sell these, as someone mentioned. You might try searching for totalizing mechanical digital counters, or even digital counters. It seems that the last time I was looking for digital counters, I encountered several dealers offering these.
They can have different types if actuation, some have a shaft that clicks over to the next digit when its partially rotated, like a micro-switch lever. These can be cam actuated. For industrial applications, these might have a 10k or higher count. They're not tiny, so having space to mount them could present a problem. You might find a 3 digit counter of this type, but I've mostly seen higher counts.
Another type has a revolution counter that looks like an odometer (driven by a small belt or friction wheel) which would need to be set up for the diameter of the handwheel for a 1:1 count. The last one I saw was on a downrigger for fishing at a specific depth. It was small, about 2" x 1 x 1 and 3 digits.
That Shack electronics store used to have a digital LCD totalizing counter module that could count switch closures. These were small (about the size of a D-cell's L x W dimensions) and used a single AA battery for power. Two momentary switches for count and reset would be required, and another for on/off. It had a total of 99,999 count, I think.
We've got answers.. From a recent Letterman show.. We don't know what it does, but it's very compact.
WB ..............
Reply to
Wild Bill
I checked Ebay last night and found several "hand counter" listings starting at $0.99 each. Cheap enough for ya? ;)
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Larry Jaques

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