- Joined
- Dec 23, 2019
- Messages
- 1,138
I purchased a set of casting from evilbay a couple of years ago. They're for, I think, the MK1.
Time to build it! The drawings in the book by Chaddock are AWFUL tiny things you have to squint at and worst of all in inch measeuments (sorry, but yuck). None-the-less, it's easy enough to CAD them up to a decent standard and in sane measurements. Hemingway have some modern plans available, but they're expensive and I believe still not metric.
Start at the beginning with the base:
These need boring to close sliding fit on the bars. I've chosen siver steel because it's precision ground, more wear resistant than bright mild and not crazzy expensive.
The book goes into great detail on some completely insane "bolt it to the lathe cross slide" craziness as it was written before one could be reliably expected to have a mill of any sort in the home shop. Judos to those that built a complete steam loco on their Myford lathe, but life is WAY to short for that kind of shananigans when you own a Bridgeport.
It's quite easy to get the fit perfect and the hole spacing accurate enough that both parts can be run up right next to each other with no binding. 3 thou clearance... Hah!
To be continued in multiple posts...
Time to build it! The drawings in the book by Chaddock are AWFUL tiny things you have to squint at and worst of all in inch measeuments (sorry, but yuck). None-the-less, it's easy enough to CAD them up to a decent standard and in sane measurements. Hemingway have some modern plans available, but they're expensive and I believe still not metric.
Start at the beginning with the base:
These need boring to close sliding fit on the bars. I've chosen siver steel because it's precision ground, more wear resistant than bright mild and not crazzy expensive.
The book goes into great detail on some completely insane "bolt it to the lathe cross slide" craziness as it was written before one could be reliably expected to have a mill of any sort in the home shop. Judos to those that built a complete steam loco on their Myford lathe, but life is WAY to short for that kind of shananigans when you own a Bridgeport.
It's quite easy to get the fit perfect and the hole spacing accurate enough that both parts can be run up right next to each other with no binding. 3 thou clearance... Hah!
To be continued in multiple posts...