pic: DeWalt carnage

[Aren_Hill]

So as referenced in the NothingButDewalt whitepaper to interface a fischer price motor you must order the motor housing, except when i enter the part number for the housing into dewaltservicenet.com it doesn't recognize it. any ideas? or where to quickly get the whole drill minus battery and charger

[MikeZ]

Originally Posted by richardmcc2

We are doing the same thing This will be our first year using Dewalts on the competition robot, but I did personally assemble 4 CIM/Dewalts (DC980) for an off season project last year. We have 4 DC940's that should arrive Monday, but I was hoping to get a head start on making some of the parts (top hat, servo plate, piano wire piece, and CIM mount). How different is the new model? Could anyone post or PM me dimensions or changes that need to be made in order to work with the new model so our team could get started this weekend?

Richard

The primary difference in dimension for us is the hole pattern. In DWG NO. 1 (Chiaphua Plate) from the NBD paper, we replaced the 0.6875" dimension with 0.745" and the 1.055" dimension with 1.110". Since this hole pattern is larger than the DC980 model, the plate needs to have a larger OD. We used 3". The servo plate will need a bit of adjusting as well to accomodate the larger hole pattern.

We do not use the method of boring out the sun gear as described in the NBD Paper, so I cannot speak to any mods needed on the transmisison case. Last year we successfully used the StevenB method of using a "sun gear adaprter" described in this thread:

http://www.chiefdelphi.com/forums/sh...ad.php?t=50091

It worked beautifully for us last year.

Hope this helps you get started. Let me know if you need more info.

Mike Zanghi
Lead Mentor
Team 624 CRyptonite Robotics

[MikeZ]

Originally Posted by Tom Line

For all you folks looking for just the transmission, check here:

http://www.ereplacementparts.com/dew...3b6 3ef475e09

Of course to be able to use the transmission, per the NBD white paper, other drill components are needed (clamshell, spindle, spindle housing, cap) As a comparision, using the DC940 model, the necessary components for 4 complete transmissions plus shipping from www.ereplacementparts.com is $307, vs $302 from www.dewaltservicenet.com vs $239 from a source who sells the whole drill without batteries and chargers. Besides cheaper, it is fun to have the students learn to disassemble, modify, and otherwise create DeWalt carnage.

Mike Zanghi
Lead Mentor
Team 624 CRyptonite Robotics

[PDF32100]

i cant wait till u guys are in need of a drill....

[Richard McClellan]

Originally Posted by MikeZ

Richard

The primary difference in dimension for us is the hole pattern. In DWG NO. 1 (Chiaphua Plate) from the NBD paper, we replaced the 0.6875" dimension with 0.745" and the 1.055" dimension with 1.110". Since this hole pattern is larger than the DC980 model, the plate needs to have a larger OD. We used 3". The servo plate will need a bit of adjusting as well to accomodate the larger hole pattern.

We do not use the method of boring out the sun gear as described in the NBD Paper, so I cannot speak to any mods needed on the transmisison case. Last year we successfully used the StevenB method of using a "sun gear adaprter" described in this thread:

http://www.chiefdelphi.com/forums/sh...ad.php?t=50091

It worked beautifully for us last year.

Hope this helps you get started. Let me know if you need more info.

Mike Zanghi
Lead Mentor
Team 624 CRyptonite Robotics

Thanks for the help Mike.....I had one other question for you or anyone else....what are the most common ways of mounting the gearboxes? The only way I've seen is using the aluminum shaft collars from mcmaster, and welding them to the frame. We are using the kit frame this year and don't have welding capabilities. Has anyone ever used Dewalts for a drive system on the KOP frame?

[MikeZ]

Originally Posted by richardmcc2

Thanks for the help Mike.....I had one other question for you or anyone else....what are the most common ways of mounting the gearboxes? The only way I've seen is using the aluminum shaft collars from mcmaster, and welding them to the frame. We are using the kit frame this year and don't have welding capabilities. Has anyone ever used Dewalts for a drive system on the KOP frame?

Richard

Here is a link showing how we mounted the Dewalts on our 2007 robot kit frame without welding. We tapped and threaded the lower half of the collar clamp, and designed the CIM plate to serve as a mount as well. We machined and bolted a "drivetrain pan" to the kit frame. The lower half of the collar clamp and CIM plate/mount were then secured to the drivetrain pan with bolts from underneath. From the pic you can also see how we used some sliders to adjust chain tension.

http://www.chiefdelphi.com/media/photos/29730

[DonRotolo]

Originally Posted by tacopaco789

and the large metal front where the bit would go

That's called the "Chuck".

Good job with the trannies though!

[Richard McClellan]

Thanks for posting the photo! Hopefully this will give our design team a little inspiration.