White Paper Discuss: Nothing But Dewalts

[FTtyler]

I have a couple quick Questions.

Has anyone had problems removing the chuck off the end of the drill?
And How did you end up getting it off?

We are having problems with it and we need some help!

[Richard Wallace]

Yes, we had trouble. Ended up using heat and impulsive force; i.e., torch, punch, and hammer. That loosened the (left) threads so we could get the chuck off. The trick is using just enough heat and impulsive force to get the job done, and not enough to break things. We had a very experienced tech-ed teacher lead the students through the exercise.

[Tapoore]

There is screw that must be undone that is inside the chuck. I believe that it is reverse threaded. To get the rest of the chuck off, we used a socket wrench with a long lever attached to it. To interface the wrench with the chuck we used a hex adapter (something that fits in the socket and is hex-shaped at the other end). The adapter also needs to fit into the chuck. Tighten the chuck around the adapter and use the wrench to carefully unscrew the chuck.
Hope that wasn't too confusing...

[Mike Martus]

It is easier and cheaper to order individual parts as per the NBD White Papers.

Dewalt has a great website http://www.dewaltservicenet.com

And YES they can be shifted with a simple servo.

[Joe P]

Originally Posted by jimfortytwo

I wanted to offer that the clamshells for the 12, 14.4 and 18 volt cordless DeWalt XRP's are interchangable for our purpose. My team also had some luck turning up limited quantities of parts with froogle.com. Also, MaxTools.com will sell you the appropriate 14.4V XRP drill for $99 + $10 shipping a piece. Unfortunatly, our local DeWalt Dealer has been unable to help us.

We have extra clamshells now and you guys are located near.
Give us a call and if you need clamshells, help or advice we are willing.
254-501-0987

Joe P
Team 647 Shoemaker Cyberwolves

[Max Lobovsky]

Can someone explain the purpose of the plastic "top hat" for the CIM modification? Is it some sort of bushing to support the shaft? Is it absolutely neccesary? Do the screws holding it to the carrier gear actually need to transfer much torque, or is it just to press it up to the gear?

[Joe Johnson]

Originally Posted by Max Lobovsky

Can someone explain the purpose of the plastic "top hat" for the CIM modification? Is it some sort of bushing to support the shaft? Is it absolutely neccesary? Do the screws holding it to the carrier gear actually need to transfer much torque, or is it just to press it up to the gear?

The sole purpose of the tophat is to keep the shifting ring from the second gear stage of the Dewalt transmisssion (which, just for clarity sake, becomes the first stage of the gearbox on the Chiaphua design because the normal first stage is eliminated) from tilting out of alignment.

Normally, the ring from the first gear stage keeps this second ring from tilting, but with the entire first gear stage removed, there is nothing but air to do this.

As to torque, there is no torque needed at all. In fact, there is no reason to have more than 2 screws. We just used 4 because there were four planets on gear stage one, which suggested to us to use 4 screws. Absolutle overkill.

Joe J.

[Max Lobovsky]

Alright, so there is no reason to even widen those holes (hardened steel isn't so fun to machine). Just find some small enough screws or other fastener.

[Joe Johnson]

Originally Posted by Max Lobovsky

Alright, so there is no reason to even widen those holes (hardened steel isn't so fun to machine). Just find some small enough screws or other fastener.

In actual fact there is no reason that the part can't be held in place by a shaft spacer. I never really thought about it, but you could just buy this part (6436K132) from McMaster.com and us that to keep the plastic tophat from backing off from the gear you press on the Chiaphua shaft.

In fact, if you could find a washer with at 5/16 hole and 1.650 or so OD, you could probably eliminate the tophat entirely (together with the above and a standard 5/16 washer)

Good thinking.

Joe J.

[Max Lobovsky]

The paper suggests that "software synchronization" may be possible for shifting the transmissions. I believe I understand what synchronization is in a shfting transmission; it's waiting until whatever you are shifting is lined up with whatever you are shifting into so that no grinding of gears or shifters occur. Now how could this apply to the DeWalt transmission? How could you tell when the gears are in the right position to shift?

[Derek Bessette]

First off I want to say that this is a great white paper. It makes it a lot easier to start more teams in an area with a small mentor base with ideas like this and AndyMark. I can't wait to try my first DeWalt transmission!!

I do have a couple questions while I wait for my order to come in.

What modifications are required to the fisher price pinion?
Has anyone mounted a gear to 1/2" shaft? My first impression is that a gear would produce a smaller side load but without a transmission in hand I may be missing some issues with mounting accuracy.

Thanks again!

[ajlapp]

same for me.......did anyone toss a spur gear on the drill output last year......if so with what implications?

[Joe Johnson]

Originally Posted by Derek Bessette

What modifications are required to the fisher price pinion?

The paper describes this.
Modify motor adaptor
Make a plate that holds motor to adaptor
Get Planet2 from extra transmission,
enlarge hole to 1/8,
press off 13T that is on FP,
press on 1/8 bore Planet2 onto FP
Mix well... ...Done!

Originally Posted by Derek Bessette

Has anyone mounted a gear to 1/2" shaft?

My first impression is that a gear would produce a smaller side load but without a transmission in hand I may be missing some issues with mounting accuracy.

Sprockets, gears, same same. The pitch radius essential determines the side load. One is as easy as the other. If you like, gears you can do the same thing with a gear that we suggest you do with a sprocket.

Joe J.

[ajlapp]

thanks for the fast reply. just for the record Dr. Joe....Dennis and I are using six dewalts so far. in fact it's nothing but dewalts except for the globe motor, but he didn't need any help.....so he's flying solo.

i don't have one in hand yet, but we're excited to give em a go.

[Gary Bonner]

I just checked the status of my Dewalt order. I had been hoping to see part of the order waiting for me when I got home today. When I placed the order, the motor adapter was on backorder until 1/24. Now it’s listed as back ordered until 2/11, and this was an alternate, P/N 626494-00. But this may be entirely moot because the transmission is now listed as out of stock and no back order date is listed. Hopefully the local service center is open tomorrow and can help me out.