Module 7 gear -- fischer price motor

[archiver]

Posted by Trevor McCulloch at 1/14/2001 12:44 PM EST


Student on team #349, The Robahamas, from International Academy and Ford Motor Co and Bosch.



Does anyone have any information on the module 7 gear on the fischer price, or any links to where we could get more information. We need enough information to make a gear that will mate with it.

Thanks in advance,
Trevor
Team 349

[archiver]

Posted by Joe Johnson at 1/14/2001 1:20 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Module 7 gear -- fischer price motor
Posted by Trevor McCulloch on 1/14/2001 12:44 PM EST:



The gear on the DRILL motor pinion has a gear that is
.7 module (each tooth adds .7 mm to the diameter). The
gear on the Fisher Price is a 32 Diametral Pitch gear
(each inch of diameter adds 32 teeth to the gear)

.7 module = 36.29 D.P.

32 D.P. = 0.794 module

DP X module = 25.4

Anyway, both are full depth gears with 20 degree
pressure angles.

The drill has 12 teeth. The Fisher Price has 16 (at
least ours do, others I consider reliable report that
sometimes get other numbers of teeth -- take yours
apart and verify the tooth count).

Joe J.

[archiver]

Posted by Mark Garver at 1/14/2001 2:08 PM EST


Student on team #68, Truck Town Terror, from Waterford Kettering/OSMTech Academy and General Motors Truck Group.


In Reply to: 32 DP Gear != .7 Module Gear...
Posted by Joe Johnson on 1/14/2001 1:20 PM EST:



Does anyone know whether you can buy these gears from Small Parts? You would need to be able to buy them from Small Parts in order to use them this year, correct?

[archiver]

Posted by ChrisH at 1/14/2001 2:13 PM EST


Engineer on team #330, Beach 'Bots, from Hope Chapel Academy and NASA JPL, J & F Machine, Raetheon, et al.


In Reply to: Can you buy both from Small Parts
Posted by Mark Garver on 1/14/2001 2:08 PM EST:



: Does anyone know whether you can buy these gears from Small Parts? You would need to be able to buy them from Small Parts in order to use them this year, correct?

There is another alternative. You can buy the material from Small Parts and hobb or otherwise manufacture your own. I've heard that some teams use wire EDM (Electrcal Discharge Machining I think) to cut their own gears. Great if you've got an EDM house as a sponsor, $$$ if you don't.

Take your pick

[archiver]

Posted by Joe Johnson at 1/14/2001 9:03 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Can you buy both from Small Parts
Posted by Mark Garver on 1/14/2001 2:08 PM EST:



Small parts does sell some 32 DP gears as I recall.
They don't sell .7 module -- almost nobody does (my
only source is Pic-Design and they are not legal this
year).

We will be having a lot of gears cut from 1/4 steel
plate as this is an unlimited material per the
additional material list. One additional benefit to
having gears made from 1/4 steel is that the flavor of
the steel is not spelled out, this allows us to use
something with a bit more carbon in it than 1018, the
typical steel from Small Parts.

Good luck,

Joe J.

[archiver]

Posted by Joe Johnson at 1/14/2001 1:49 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Module 7 gear -- fischer price motor
Posted by Trevor McCulloch on 1/14/2001 12:44 PM EST:



The gear on the DRILL motor pinion has a gear that is
.7 module (each tooth adds .7 mm to the diameter). The
gear on the Fisher Price is a 32 Diametral Pitch gear
(each inch of diameter adds 32 teeth to the gear)

.7 module = 36.29 D.P.

32 D.P. = 0.794 module

DP X module = 25.4

Anyway, both are full depth gears with 20 degree
pressure angles.

The drill has 12 teeth. The Fisher Price has 16 (at
least ours do, others I consider reliable report that
sometimes get other numbers of teeth -- take yours
apart and verify the tooth count).

Joe J.

[archiver]

Posted by Ed Sparks at 1/14/2001 4:57 PM EST


Coach on team #34, The Rockets, from Bob Jones High / New Century High and DaimlerChrysler.


In Reply to: Module 7 gear -- fischer price motor
Posted by Trevor McCulloch on 1/14/2001 12:44 PM EST:



Go to the link below and select the "Engineering Library". Hope this helps.