Skip to main content

Burrell Traction Engine Differential Gear Cutting

 Differential Gear Cutting ..

Well I thought I'd seen the back of gear cutting, but the differential has a spur gear of 95 teeth. 
I bought a new vertex rotary table before Christmas. and also had the dividing attachment to mount on in the position of the handle. With this setup I was able to start cutting half depth teeth, as a tester, so I have an easy job that will keep us busy for a few weeks. 

The maths involved for 95 TEETH, using a 19 hole plate and indexing 18 of the 19 holes. This is fairly easy as its simply 1 hole less each time, so keeping track is simpler than other gears. The rotary table has a ratio of 90:1, so 1 full turn would result in 90 teeth so to get the extra 5 teeth is 18/19 of a turn for 95 teeth.




<-Photo    Teeth machined to 0.100" depth for first pass to check dividing.
And finished Happy Valentines !!

Until next month stay safe; make swarf; have fun!

Stephen.

Labels:

Comments

Post a Comment

Popular posts from this blog

1" Minnie Traction Engine By Stephen Meredith   Background Working Progress (Gears) Front End Parts Following the completion of a small marine steam engine "Trojan Engine", I decided to tackle a larger project. Having visited various shows and the model engineers Exhibition, I decided to buy the Construction book for building the popular 1" scale 'Minnie' traction engine. The initial workshop experience was limited but keen to learn, and research has enabled me to get it this far. A s can be seen, this is basically finished well almost, it steams, and runs well a few tweaks are needed but tweaks don’t make piles of swarf. The intention was to show the engine and run it, at rallies but what I really wanted was a capable engine that could pull an adult or (me) on a field. This engine was, therefore, a stepping stone to be able to tackle the engine I wanted. After research, I bought a set of drawings for the Plastow 3” Bur...
Post a Comment
Read more

Bridgnorth Mini-Gala Featuring Traction engines.

 Bridgnorth Mini-Gala Featuring Steam Road Miniatures. (Pictures from Saturday 1/11/25)  Bridgnorth Mini Gala: End of Season Steam Inspiration Bridgnorth once again marked the close of the running season with its Miniature Steam Gala , a compact but characterful gathering of miniature road vehicles, steam lorries, and traction engines . The event has become a highlight for enthusiasts, and this year’s display was every bit as enjoyable as before. My attendance was unplanned — much like the previous year — but that seems to be part of the charm. What began as an impromptu visit quickly turned into another opportunity to watch a fine collection of engines in steam. The station car park was once again transformed into a working yard of miniature traction engines, all hissing, chuffing, and radiating warmth against the chill of early November. It’s a real credit to the owners and crews who take the trouble to bring their engines out at this time of year. Keeping steam up in unp...
Post a Comment
Read more

Midlands Model Engineers Exhibition 2023.

  Midlands Model Engineers Exhibition 2023. This year’s Model Engineers Show 2023 was a huge success! All four days of the show were fantastic with exhibitors and visitors alike enjoying plenty of opportunities to purchase items, learn and explore the very latest in machinery tools and model engineering. The 2 exhibition halls were abuzz with vibrancy, excitement and anticipation. I went with a usual shopping list, and a few parts that I had organised from suppliers to take to the show for me for collection and postage saving opportunity. Centre piece if the show for me, a huge amount of work in this engine and the builder, sadly no longer with us, only finished it last year.   A fantastic selection of Loco's on display and also a good number of Traction engines both engines in steam on the parade field, but also a number of static models in side. It appears this year whilst there were still a few suppliers missing, there were a good number of static displays to improve t...
Post a Comment
Read more