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Message |
    
Gerald_D
Registered
Username: Gerald_d
Post Number: 281
Registered: 11-2005
| | Posted on Tuesday, October 10, 2006 - 03:53 pm: | 
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This Y-Car can only be retrofitted to a SB PRT standard gantry if the 3"x3" square tube spacers of that gantry are cut away....(link)
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Gerald_D
Registered
Username: Gerald_d
Post Number: 284
Registered: 11-2005
| | Posted on Tuesday, October 10, 2006 - 07:37 pm: |
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For those that want a printout with overall dimensions:
This car makes no provision for the standard horizontal "hold-down" rollers. See this thread for alternative ideas. |
Gerald_D
Registered
Username: Gerald_d
Post Number: 285
Registered: 11-2005
| | Posted on Wednesday, October 11, 2006 - 07:05 am: |
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The absolute key to all of this is laser-cut steel, and you being able to find someone who will cut it for you. Before you go any further, I suggest you mail the SBCarInches.zip of the y-car to some potential suppliers to get some confidences and costs.
Those drawings still have grey areas for the retrofitters. Eg. all the holes needed to attach the motors, springs, wire guide, and to pass through connector cables. For example, most PRT's have gearboxes on the motors, and the fixing screws come from behind the motor plates - do these screwheads need a clearance space cut into the car? |
Scott Worden
Registered
Username: Scott
Post Number: 8
Registered: 06-2006
| | Posted on Wednesday, October 11, 2006 - 04:50 pm: |
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Gerald,
What do you think about placing a 3/16" thick aluminum plate (approx. 16" x 22.375") on top of the utility strut and under the 3" x 3" angle? An opening would be machined for the Z, router/spindle, and dust hose. It would be bolted down with the original 8 large bolts at the four corners and some extra bolts along the struts.
Scott |
Gerald_D
Registered
Username: Gerald_d
Post Number: 289
Registered: 11-2005
| | Posted on Wednesday, October 11, 2006 - 05:03 pm: |
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Scott, that would stop racking for sure, but it won't stop the car from twisting (lifting one wheel). Also I think the connection to the tower should be broadened. |
Scott Worden
Registered
Username: Scott
Post Number: 9
Registered: 06-2006
| | Posted on Friday, October 27, 2006 - 06:58 am: |
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Well, I went ahead and made a plate as described in my above post and it worked out really good. No racking/wiggling and due to the outboard hold down that I made earlier, the force needed to lift one wheel is quite substantial so I don't think that it's going to be a problem.
Scott
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Gerald_D
Registered
Username: Gerald_d
Post Number: 328
Registered: 11-2005
| | Posted on Friday, October 27, 2006 - 07:25 am: |
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Looks really good! And it can be done with a saber-saw too. 
If you went with 1/8" plate, a bit wider so that you can bend the sides down at right-angles, then you will have a nice base for outriggers on the upper part of the tower....?
Maybe bend the sides twice (2 bends) to make a channel.....? (watch the back of the v-rollers)
More screws at the white dots won't do any harm, especially if you have a bent-down edge:
(A bent down edge will do nothing for stopping the car from twisting, but it will let you use a much thinner plate) |
Scott Worden
Registered
Username: Scott
Post Number: 10
Registered: 06-2006
| | Posted on Friday, October 27, 2006 - 02:55 pm: |
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Yeah, the plate pulled up tight there, but I still might put a few more bolts at the corners for even more stability.
Not shown in the photo, due to the plate moving the utility strut down 3/16", I had to cut a 45 on each end of the utility strut to provide some clearance for the rails.
The bot did a nice job of slowly cutting this one out and making the holes. |
30. Y-Car 
SBCarInches.zip
Cardims.pdf