Gallery, Projects and General > How do I??
Gear parameters
vtsteam:
ps. all of your setups including the mill gashing will be "handed". Be careful about this, or you might make a left handed worm and wheel (assuming you want right). Or worse, one of each. :bang:
djc:
--- Quote from: vtsteam on September 05, 2020, 10:43:08 AM ---Also, your hob needs to be the same diameter as your worm.
--- End quote ---
AIUI, that is only the case if you want to make an enveloping gear.
The splash screen on this video seems to show the three examples of worm-wheel combinations that I am aware of:
vtsteam:
Nope, I said the same size as the worm.
And the wheel width should be the same width as the present wheel.
We're duplicating existing parts, yes?
John Rudd:
Yep,I got all that.....
What I'm now unsure of is the material for the hob....I'm thinking silver steel?
But at the diameter needed, there arent many suppliers that do ss at diameters bigger than inch....
Tool steel as an alternative maybe....
Thn the next dilemma, the existing driven gear is brass....should I use something a bit better wearing, like phos bronze? Assuming the worm is hardened... :Doh:
Pete.:
--- Quote from: John Rudd on September 04, 2020, 03:28:32 PM ---Unfortunately my 11x27 lathe has an issue with the power feed...
The worm drive gear is wearing...not suprising made from brass....
A new one,if I think its the right one, is around £25..but is an a 12 week lead time.
I'm sure I can make a new one....
So, I know its diameter, teeth count is 17 ( seems an odd number..)
What I dont know is the DP and the angle of the teeth...
How would I determine these ?
--- End quote ---
The angle of the teeth will be the helix angle of the worm at the pitch diameter (not at the OD). Helix angle increases as diameter decreases on all screws so use the pitch diameter for a happy medium.
So, what is your worm TPI and diameter? From those you can work out the helix angle. Also look here for a very good source of info:
http://103.71.168.43:81/mis/files/coursefiles/AY2018%20-%202019/Mech/ME6601/cf~pdf%C3%A2%E2%82%AC%E2%80%9C%20WORM%20GEARS~63~ME66011542615387-1.pdf
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