Boxford back gear

Boxford back gear

This topic has 9 replies, 8 voices, and was last updated 14 April 2019 at 17:47 by Bazyle.

Viewing 10 posts - 1 through 10 (of 10 total)

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13 April 2019 at 20:25 #404941
kevin large
Participant
@kevinlarge76611
While drilling a large hole in back gear the small gear broke into pieces it looks like it's been broken before and locktited n the shaft

My question is how many teeth should there be and what is the pitch is what cutter would I need to make another
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13 April 2019 at 20:25 #26555
kevin large
Participant
@kevinlarge76611
13 April 2019 at 21:03 #404946
Yngvar F
Participant
@yngvarf
Is it the small gear on the spindle?

Lathes

I think he does a part exchange on the back gear spindle too.

Edited By Yngvar F on 13/04/2019 21:04:33
13 April 2019 at 22:37 #404961
David George 1
Participant
@davidgeorge1
Why were you drilling a large hole in your back gear!

David
13 April 2019 at 23:43 #404964
Michael Gilligan
Participant
@michaelgilligan61133
Posted by David George 1 on 13/04/2019 22:37:28:

Why were you drilling a large hole in your back gear!

David

.

… the wonders of English ambiguity
14 April 2019 at 00:22 #404969
not done it yet
Participant
@notdoneityet
You can work out the DP from the diameter and tooth count of the gear which was in mesh with it ( at least, and likely other gears). Now knowing the DP, you could measure the centre to centre distance and work out the other gear tooth count from that. All straight forward once you look up the formulae for sorting out gears.
14 April 2019 at 11:01 #404999
Dave Halford
Participant
@davehalford22513
From the tumble reverse info on that link it looks like the mk2 is 20pa and the mk1 is 14.5pa.

European 20pa cutters are rare secondhand and a lot of new Asian sets are module and not DP, but HPC is another source of machined steel generic 20pa gears.
14 April 2019 at 13:44 #405013
kevin large
Participant
@kevinlarge76611
It looks like a dp16 14.5 pa still not sure how many teeth yet as I can't all the bits

So if someone can confirm that would be great
14 April 2019 at 15:24 #405020
Saxalby
Participant
@saxalby
Just measured the small back gear on my Boxford and it is 24 tooth 1.625 inches OD which makes it 16DP
14 April 2019 at 17:47 #405033
Bazyle
Participant
@bazyle
If you make the replacement out of aluminium it will be weaker and act as a sacrificial one for future problems. Then also make it narrower so it cannot be in mesh when the bull wheel is retracted for direct drive. This saves the danger of the back gear left hand lever being engaged when the bull wheel is still engaged with the pulley.
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