GEAR CUTTING

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GEAR CUTTING

This topic has 16 replies, 8 voices, and was last updated 11 February 2013 at 13:05 by RICHARD GREEN 2.

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10 February 2013 at 12:57 #111564
RICHARD GREEN 2
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@richardgreen2
This is a 21" diameter final drive gear for a 6" scale Burrell traction Engine, with 124 teeth , 6DP,

Using a Vertex 14" rotary table, and a homemade division plate,

The casting includes the winch drum, and weighs approx 100 KG

Richard.

Edited By RICHARD GREEN 2 on 10/02/2013 13:08:00
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10 February 2013 at 12:57 #15622
RICHARD GREEN 2
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@richardgreen2
Cutting the final drive gear for a 6″ traction engine.
10 February 2013 at 14:14 #111575
Another JohnS
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@anotherjohns
Well done!

Another JohnS.
10 February 2013 at 14:35 #111579
Phil P
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@philp
You have my sympathies winding that knee up and down for every tooth, maybe more than one pass for each.

Phil
10 February 2013 at 14:44 #111581
John Stevenson 1
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@johnstevenson1
Richard now requests to be known as Popeye Green.
10 February 2013 at 17:01 #111601
RICHARD GREEN 2
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@richardgreen2
Phil and John,

The TOS mill has power feeds and rapids,

I raised the table under power to cut the teeth,………………….Then used the "rapid" to lower the table to then set it for the next tooth, no arm ache at all !

The smaller gears for the 6" Burrell were cut on an Elliott U2 mill (no rapids), Power up and hand crank down, I calculated on a 95 tooth gear that I cranked the table down approx 2000 turns on the handle !!

Then I decided to use the TOS mill !

Richard, ( Popeye)
10 February 2013 at 17:07 #111602
Sub Mandrel
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@submandrel
Interesting stuff Richard – shows how a horizontal mill is better than a vertical for some jobs.

Neil
10 February 2013 at 17:08 #111603
Phil P
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@philp
Power feed………….I take it all back, you are a wimp

Just kidding, are you doing your own bevel gears for the diff by the way ?

Phil
10 February 2013 at 17:15 #111606
RICHARD GREEN 2
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@richardgreen2
Neil,

I just couldn't do it any other way, As you can see the casting overhangs the rotary table by 31/2" all round, clearance would have been a big problem , it only just fitted on the mill as it was, maximum table load is 250KG so including the rotary table I was just under that figure,

Richard,
10 February 2013 at 17:18 #111607
RICHARD GREEN 2
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@richardgreen2
Phil,

I'm not doing the bevel gears and pinions for the differential, I've had them professionally cut, They are a bit out of my league, all those calculations screw my head up!

Richard,
10 February 2013 at 17:25 #111611
Springbok
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@springbok
Well all I can say is congratulation a wonderfull job.

Bob
10 February 2013 at 17:28 #111613
RICHARD GREEN 2
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@richardgreen2
Thanks Bob,

Richard.
11 February 2013 at 12:28 #111685
Anonymous
Hi Richard,

Thanks for posting the pictures, very impressive. When I get round to machining the final drive gears for my engines I will be using a similar set up; good to know that it works. My rotary table isn't as fancy, in that it has no division plates, but fortunately my final drive gears have 72 teeth, so easy division. It seems slightly odd that the final drive gears on my 4" engine are 5DP, whereas yours are 6DP.

I don't have power drive on the knee of my horizontal mill, so I'd better start eating that spinach.

Regards,

Andrew
11 February 2013 at 12:44 #111689
RICHARD GREEN 2
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@richardgreen2
Andrew,

Then they will call you "Popeye" Johnstone !

Richard.
11 February 2013 at 12:58 #111691
RICHARD GREEN 2
Participant
@richardgreen2
Andrew,

Your final drive gear has 72 teeth, mine has 124 teeth, so even though my gear is larger , mine are going to be smaller teeth, just how it was designed I suppose.

Richard.
11 February 2013 at 12:58 #111692
Bazyle
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@bazyle
A balance wieght and pulley would make it easier on both machine and operator.
11 February 2013 at 13:05 #111694
RICHARD GREEN 2
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@richardgreen2
Bazyle,

You would need a big weight to counter balance the knee,table,rotary table and casting, would probably have to buy 3 or 4 large anvils !

Richard.
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