Finney7/SDMP gearboxes

Dikitriki

Flying Squad
Hi,

I've been asked to assess a new small motor we are looking at by building an 0-6-0 chassis and then giving it a test round Heyside. It made sense to pair it with one of the SDMP gearboxes, and I selected the Mkits 40:1L, 12mm. To translate the code it means I will be using Markits 40:1 gears; the 'L' means large in that it is a 2 stage gearbox, and 12mm is the distance between the mounting screws on the motor front. In this configuration, I will be able to drive the rear axle of the 0-6-0 with the motor vertical in the firebox. The gearbox is contained within the ash pan and is invisible from normal viewing angles. I shall look at the chassis/motor mount on my workbench thread, but thought it worthwhile having a detailed look at the gearbox.

What do you get?

P1010144a.jpg
P1010143a.jpg
A substantail etch in 0.7mm nickel silver, 2 gears and worm drive 40:1 ratio, idler shaft and 4 flanged slieved ball bearings. Oh, and a blow-by-blow set of instructions. Follow them carefully, and pay particular attention to not filing the etched cusps off.

And made up....

P1010145a.jpg

P1010146a.jpg

P1010147a.jpg

P1010148a.jpg

I had no issues. There are washers provided and I used two on each of the idler shaft and final drive axle (top picture on the right hand side). These are a bit fiddly to insert, so I soldered them together in pairs so there was just a little side play but no slop, and the gear wheel was in the middle of the worm drive. It took a little while to adjust the screws securing the motor to the gearbox to get a perfect mesh.

I ran it in for about 40 minutes, until it was quiet and smooth, and it now revolves at very low speed without any cogging.

Finally, for size comparison, it is pictured with a Slater's gearbox and Mashima 1833.

P1010149a.jpg

The gearbox can be fitted to motors with 12mm or 15mm fixing screw centres, but you have to specify this at the time of ordering as there are different etches to suit.

Richard
 

Steph Dale

Western Thunderer
Richard,
That looks pretty much 'as intended', which is good.

I'll be interested to hear how well the motor works out. It was certainly pretty good when I tested it here.

Steph
 
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