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- Mar 22, 2014
- Messages
- 848
I purchased an old Goodell Pratt No 440 Speed Indicator at a barn sale today. It appears to be just a turns counter. It has two rubber couplings, I guess one for the indicator shaft and one for the lathe, drill press or milling machine that you want to measure the speed of.
I guess it can be used to determine RPM by coupling it to the work for a certain time period and then doing some math. Also I guess you could determine feed rate by using a wheel of a certain diameter on the indicator and pressing it tangentially onto you work.
Anyone know anything about this neat little instrument? There was no information with it, just the original box. Never saw one before.
I guess it can be used to determine RPM by coupling it to the work for a certain time period and then doing some math. Also I guess you could determine feed rate by using a wheel of a certain diameter on the indicator and pressing it tangentially onto you work.
Anyone know anything about this neat little instrument? There was no information with it, just the original box. Never saw one before.
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