|1019 forum posts|
Andrew, does the mill have a powered knee or did you have to crank all of those cuts ?
|Andrew Johnston||09/02/2019 08:26:06|
4377 forum posts
Nope, all done by hand. I actually cut six gears, four for my two engines and a mate who is building the same engine just 'happened' to have his two blanks ready at the same time. That makes 432 teeth; 12 turns down and 12 turns up for each tooth. That's a lot of handle w**king. I could do about half a gear at a time before needing tea and biscuits.
|Andy Carruthers||09/02/2019 09:52:00|
176 forum posts
Counts as exercise in my book, and lovely job well done too
|Mark Simpson 1||11/02/2019 10:18:03|
|63 forum posts|
Andrew: Thank you, it's really good to know that someone with more experience has cut these large gears in the same way as I intend to... Horizontal RT, lock X and Y, and wind the table up and down... (good exercise!)
On the division front I think I will have to do something more than "wind the handle to a spreadsheet"
I do use my rotary table instead of a bigger lathe, so some way to drive the rotary table continuously would have additional benefits....
I've priced the stepper motor route at about £100 ( I have a suitable power supply already) and will have a go that way, building a whole division mechanism for the RT to cut 3 gears seems like too much effort
I do still like Jason's Idea to produce a large division plate and bolt it to the top of the gears then release the worm on the RT.... Easy, Cheap and I can check the accuracy of the division plate before cutting any teeth by measuring between the holes... I love a practical solution!
|Andrew Johnston||11/02/2019 11:11:37|
4377 forum posts
These are not precision gears. As has been stated, in fullsize the final drive gears would have been as cast, with any lumps tidied up with a hammer and cold chisel.
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