Gallery, Projects and General > How do I??
Gear parameters
John Rudd:
Unfortunately my 11x27 lathe has an issue with the power feed...
The worm drive gear is wearing...not suprising made from brass....
A new one,if I think its the right one, is around £25..but is an a 12 week lead time.
I'm sure I can make a new one....
So, I know its diameter, teeth count is 17 ( seems an odd number..)
What I dont know is the DP and the angle of the teeth...
How would I determine these ?
tom osselton:
I’ve heard roll it on plastercene then measure the angle.
Lew_Merrick_PE:
--- Quote from: John Rudd on September 04, 2020, 03:28:32 PM ---Unfortunately my 11x27 lathe has an issue with the power feed...
The worm drive gear is wearing...not suprising made from brass....
--- End quote ---
Hi John -- The real is the Diametral Pitch (or Module) of the gear. I assume it is a Drive Gear rather than a pure Spur Gear. That information plus OD and ID measurements would help identify it. -- Lew
John Rudd:
Sorry, I seem to have written in haste....
The feed drive shaft passes through a worm gear at the rear of the apron, this in turn drives the brass gear in question which is placed at right angles to the worm, thus providing the drive for the carriage and powered cross feed.
I guess the brass gear is probably MOD being a Chinese made lathe, but there is a chance it could be DP....
So armed with the gear's od and teeth count should aid identifying DP or MOD?
chipenter:
The worm will be the same pressure angle and is straight , cut a paper template and measure that .
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