bevel gears

[Peter Russell 4Participant @peterrussell4]

Hi

Has anyone built Ladt Stephanie a six coloumn pumping beam engine.?

What did you do for the 2 bevel gears?

[Peter Russell 4Participant @peterrussell4]

[JasonBModerator @jasonb]

I expect many used the gears that Reeves supplied but they no longer list them. If you can post the spec of the gears eg DP, number of teeth, etc then it will help with suggesting other options.

I've cut governor bevels for other engines, they don't need to be exact as there is no real load

Edited By JasonB on 08/09/2022 13:28:19

[Peter Russell 4Participant @peterrussell4]

The DP is 40 and the ratio is 24/32.

Regards

Pete

[JasonBModerator @jasonb]

With that ratio you will almost certainly have to cut them as it is unlikely to find something available off the shelf

A simple single point tool or involute cutter can be used combined with a rotary table or other means of indexing. Work out the meeting angle of the two gears and set the rotary table to that, cut one gear using the x axis and the other using the Y axis and the sum of the angles will be 90degrees

[Jim NicParticipant @jimnic]

I bought the gear set shown here on my Norden engine off E bay. They needed the centre holes adjusting, one with a sleeve and one opening out but that was easy done. The pair cost me about £20.00.

  I'm not familiar with the Lady Stephanie so I don't know the reason for the different sizes in the governor drive train or how important it is.  If it's not that important to you just search for "Brass bevel gears" and take your pick.

Jim

Edited By Jim Nic on 08/09/2022 15:19:03

[Anonymous]

Posted by Jim Nic on 08/09/2022 15:12:48:

…don't know the reason for the different sizes in the governor drive train or how important it is.

For centrifugal governors the controlling force is proportional to the square of the angular velocity. Higher operating forces mitigate the effects of friction within the governor. For slow revving engines, such as a pumping engine, it is common for the bevel gear drive to the governor to be step up so the governor runs faster than the engine.

Andrew

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