Gear Cutter

[doubleboost]

I am looking for a gear cutter to make some change wheels for My Harrison Lathe
The size I need is a "14DP to cut 63 teeth" I belive it is the number 2

 

[ford34/2]

John,you have PM.
Stan

 

[AndyStobbs]

Loads on ebay. Whats the pressure angle on the harrison? Metric change wheels are on my to do list.

 

[ford34/2]

yes but sadly 63T and 127T are as rare as hens teeth. I hunted and watched for years and bit the bullet and got one made. ----The cost was £35 + Carriage, cheaper than s/h. he had it cast, then machined the blank and then took it to a gear cutter.


Stan

 

[doubleboost]

Loads on ebay. Whats the pressure angle on the harrison? Metric change wheels are on my to do list.

14 1/2 deg 14 DP I can only find a full set in China

 

[MattF]

That's the same setup as Drummond gears?

 

[AndyStobbs]

yes but sadly 63T and 127T are as rare as hens teeth. I hunted and watched for years and bit the bullet and got one made. ----The cost was £35 + Carriage, cheaper than s/h. he had it cast, then machined the blank and then took it to a gear cutter.


Stan

Thats good, who was that from?
I was going to get a 127T timing belt from a citroen, make a plywood/mdf disc to mount it on and index from that to cut my own.
Lot of effort for £35 + carriage.

 

[ford34/2]

Note the Date, but contact Alan and double check.Any other info is in this E mail copy.
Stan

From: "alanhearsum@btinternet.com" <alanhearsum@btinternet.com>
To: Stan Gordon
Sent: Sunday, 15 September 2013, 15:45
Subject: Re: Want a 63T tooth gear-Harrison 140
Hello Stan
Glad you made a bid on the gear on ebay. I shall start machining the 63 tooth gear on Monday 16th. I will then take it to the gear cutters on Tuesday. Normally they take a couple of days so you should have it posted to you next week. I will weigh for postage and let you know total cost. Blank will be £10+Machining £10 + Gear cutting probably £15 = £35 + postage.
I will keep you informed cash will be alright providing you wrap in cardboard. I will let you know cost it should not vary that much from this quote.
Regards
Alan

I could make you one and get it gear cut for you in Sheffield. I guess you know that an 127 tooth gear 14dp x 14.5 degree pressure angle x 5/8 inch face width x 5/8 inch bore is 9.274 inches outside diameter. Does the Drummond have room to work with such a large gear? Let me have your email address if you are interested.
Best of luck
Alan Hearsum, Rats Castle, Dale End, Bradwell, Hope Valley, Derbyshire S33 9HP.

 

[AndyStobbs]

So you went for 63T in the end Stan?

 

[ford34/2]

Yes I got a 127T from a local tool/engineering supplier in Jarrow. The rest of my set of changewheels from Online sellers, E bay and Jumbler classifieds, its taken several years to get a full set, sadly they were all missing when the lathe arrived.
Th 63 was used to work out the feed and gearbox combinations to cut imperial threads, I have been told this is a no go solution and the 127 is the way to go, when time allows I`ll try and see if the 127 can be introduced in favour of the 63.----on the to do list, for short threads it seems spot on, over a descent length maybe not so accurate, I dont realy know.

Stan

 

[roofman]

Yes I got a 127T from a local tool/engineering supplier in Jarrow. The rest of my set of changewheels from Online sellers, E bay and Jumbler classifieds, its taken several years to get a full set, sadly they were all missing when the lathe arrived.

Stan

ime on the same hunt Stan but added complication as my Harrison is Metric..

 

[doubleboost]

ime on the same hunt Stan but added complication as my Harrison is Metric..

I will be making a 63 once I find a cutter
Could make a few if the demand was there

 

[AndyStobbs]

Yes I got a 127T from a local tool/engineering supplier in Jarrow. The rest of my set of changewheels from Online sellers, E bay and Jumbler classifieds, its taken several years to get a full set, sadly they were all missing when the lathe arrived.
Th 63 was used to work out the feed and gearbox combinations to cut imperial threads, I have been told this is a no go solution and the 127 is the way to go, when time allows I`ll try and see if the 127 can be introduced in favour of the 63.----on the to do list, for short threads it seems spot on, over a descent length maybe not so accurate, I dont realy know.

Stan

Would've thought it would either be a good thread or a bad one. If it cuts an inch of good thread it'll cut a yard, not the kind of thing that would compound any error.
I got no change wheels with mine, but it does have a comprehensive gearbox.

 

[MattF]

Th 63 was used to work out the feed and gearbox combinations to cut imperial threads, I have been told this is a no go solution and the 127 is the way to go, when time allows I`ll try and see if the 127 can be introduced in favour of the 63.----on the to do list, for short threads it seems spot on, over a descent length maybe not so accurate, I dont realy know.

Stan

Don't you mean metric threads? There was a discussion on the list a while ago regarding that. Apparently the difference in real life between the 63 and the 127 is inconsequential. Leadscrew wear would likely throw more error into the thread than the 63/127 aspect would.

 

[roofman]

I will be making a 63 once I find a cutter
Could make a few if the demand was there

that would be great John...would this enable me to cut imp or metric?

 

[AndyStobbs]

Hpc can supply you a cutter db.

 

[ronan]

Dunno if you are a member on the model engineers forum John, but you could ask there too.


http://www.model-engineer.co.uk/forums/postings.asp?th=109138&p=1#PostTop

 

[Pete.]

Yes I got a 127T from a local tool/engineering supplier in Jarrow. The rest of my set of changewheels from Online sellers, E bay and Jumbler classifieds, its taken several years to get a full set, sadly they were all missing when the lathe arrived.
Th 63 was used to work out the feed and gearbox combinations to cut imperial threads, I have been told this is a no go solution and the 127 is the way to go, when time allows I`ll try and see if the 127 can be introduced in favour of the 63.----on the to do list, for short threads it seems spot on, over a descent length maybe not so accurate, I dont realy know.

Stan

127 teeth is used for perfect interpolation but 63/64 being half that is so close that it is often used in a standard set of change-gears. Here's a chart for gear combinations for an Atlas lathe.

 

[doubleboost]

Hpc can supply you a cutter db.

Have you a link

 

[doubleboost]

that would be great John...would this enable me to cut imp or metric?

It converts ether way you need some other gears but these are availabl
This video shows how to set it up