Thread: Gears, gears and more gears

Originally Posted by RayG

https://woodgears.ca/gear_cutting/template.html

Nice animation.

The animation I was thinking of was more along the lines of Wikipedia. Purely instructional.

I like to keep checking on the Woodgears website as there are some absolutely brilliant designs there. When I get going with woodworking I intend to make some of the machines, like the tenon machine.

Dean

Originally Posted by RayG

https://woodgears.ca/gear_cutting/template.html

Nice animation.

The animation I was thinking of was more along the lines of Wikipedia. Purely instructional.

I like to keep checking on the Woodgears website as there are some absolutely brilliant designs there. When I get going with woodworking I intend to make some of the machines, like the tenon machine.

Dean

Maybe one of the more erudite members could advise me

There is a current ebay listing for a 8DP 14.5 PA gear cutter #4 which cuts 26 to 34 teeth . I theoretically need the #5 which cuts 24 teeth .

Question. Will the #4 cutter suffice for my needs ? Mike

This is interesting and maybe what I need

How a rack cutter can produce gear teeth

I would not do anything until you remove the gear and measure it up properly...

Also Chinese gear cutters seem to run backwards number wise compared to the ones made in countries like US, UK, Au, etc etc

Originally Posted by morrisman

There is a current ebay listing for a 8DP 14.5 PA gear cutter #4 which cuts 26 to 34 teeth . I theoretically need the #5 which cuts 24 teeth .

Question. Will the #4 cutter suffice for my needs ?

Not really. It could be used if there were no alternative but best not to (ie end of the world approaching and that was the only cutter available to make the necessary spare part and avert global tragedy). These form cutters are made so that they are most accurate at the bottom end of their range. Using that #4 you would get a beautiful 26t gear but if you used it for a 24T it would not be as good. a number 5 cutter will only cut 5 different size gears, so the change in geometry is pretty severe at that end of the range.
For the one gear I'd lend you one but all my cutters are 10DP or more.

Michael

Originally Posted by Michael G

Not really.

Michael

Agree. If you are making the gear from cast iron you could easily use a fly cutter.

Shape a single point cutter to the existing profile and your good to go.

A fly cutter can cut just as good as an involute provided you go slowly. You've only got a few teeth to do anyway.

Rob

Just let me know if you want the gear profile made up.... I can print it out 1:1 and mail it down if you wanted the gear profile... Or print out a heap of different ones...

This looks big....
PFAUTER ABW
and too far away ...

This method might do
How to correctly profile a single point gear cutter - easy method - YouTube

The spindle is out

With the gear now acccessible and easy to measure . It is 2.6" OD

So 24+2 and 2.6 equals 10DP

SO I need a 10DP cutter

I managed to cut off a section of cast iron for the new gear blank. I destroyed 2 HSS bits attempting removing the hard skin from this chunk of iron , I changed to a Carbide tip and that worked OK , but I had to lower the rpm

A 10DP cutter I do have. PM me with an address and I can send it on holiday if you like.

Michael

What method are you going to use to replace the damaged gear?

Originally Posted by pipeclay

What method are you going to use to replace the damaged gear?

My plan is to use my Harold Hall dividing head and the 45 mill/drill . i might use a slitting saw first,to remove some of the iron , then change to the gear cutter .

The broken gear appears to be a press fit in the cone . I will use loctite on the new gear .