Does anybody recognise these change gears?

[southernchapParticipant @southernchap]

These were in a lot I picked up at an auction for a largish engineering firm.  There were three of each size, but I just don’t know what they come from.  They could be from a lathe, or I guess, from a mill’s power feed.

 

Any help most appreciated. 😉😊

 

[cedric 1Participant @cedric]

Seems unlikely to be change gears with the splined boss in the middle. Maybe out of a QC gearbox?

[Chris GunnParticipant @chrisgunn36534]

My Bantam has splined change gears, but these are not for a Bantam.

Chris Gunn

[Tony Pratt 1Participant @tonypratt1]

From a Cincinnati dividing head gearbox or similar.

Tony

[BazyleParticipant @bazyle]

DP? – would give an idea of size of machine. Tooth counts? – dividing head sets have some characteristic numbers.

[southernchapParticipant @southernchap]

Shame if they’re not change gears.  Colchester and Harrison change gears fetch a bit of a decent price on eBay. 😄

They have poorly stamped markings on them, 175/76, 175/56, and 175/44 IIRC.

I suspect these might end up at the recycling centre. 😳

[DC31kParticipant @dc31k]

As above, measure the OD of the gears and report it. That would enable us to determine their specification and thus what they could potentially fit.

With the boss removed and an alternative centre detail made, they have the potential to become change gears to the right person.

[DC31k]

On DC31k Said:

As above, measure the OD of the gears and report it. That would enable us to determine their specification and thus what they could potentially fit.

With the boss removed and an alternative centre detail made, they have the potential to become change gears to the right person.

OD would be from the tip rather than the root, yes?

[southernchap]

On southernchap Said:

OD would be from the tip rather than the root, yes?

Yes please, tip to tip.

If you do all three, any uncertainties in the measurement will be minimised.

You are helped because they all have an even tooth count, so making the measurement is easier.

FWIW, I am leaning towards a dividing head-type application (helical/spiral milling) as they are all multiples of four. My feeling is that a ‘by fours’ sequence of tooth counts is more common here than in change gears.

[Author]

Posts