Posted 12 August 2010 - 05:02 PM
Here are progression Pictures:
Going to have to stop work for a week on it till I get back from my trip.
Hopefully I can mod the snowmobile guts to fit on the cart to keep the cost down as the current about of money invested in it is $0 and I hope to keep it as close to that as possible.
Besides just having a cart to have fun in, I plan on bolting on a cage for a driver and gunner for use at games. I want to keep it as small as possible to be a small target for rockets.
Posted 13 August 2010 - 04:03 AM
Cut away on the motor drive shaft even more to get to the bare shaft.
Ground down shaft to fit new bearing assembly from lower final snowmobile drive. Still got to grind down on the shaft another 3/4".
If any of you have seen a snowmobile and how the drive system works, imagine this:
Its essentially identical in function except the back drive pulley floats with the axle and mounts above the electric motor.
From the drive pulley, there is the disk brake and a gear box that drops down to drive the cogs that turns the track.
Where the drive cogs where normally be, instead there is the modified motor drive shaft that connects to the axle.
Where that cog is spinning turning the track, the modified motor shaft is which bolts to the drive shaft. The "secondary clutch" (drive pulley), instead of being in a fixed position, will float with the axle.
Current Investment, $0. If I salvage a bearing, I hope the total cost of this build will be under $20. If I have to order a new bearing assembly for one of the drive lines, total investment will only be about $30. That's for a running cart if all continues to work out.
This post has been edited by Orpackrat: 13 August 2010 - 04:10 AM
Posted 13 August 2010 - 05:13 AM
Random numbers for the most part but if the snowmobiles drive cog can get the sled to a top speed of 70MPH and is approx 6" in diameter, the tires on the cart are about 18" in diameter which is 3 times the size. That equates to about 210MPH. Of course, while I am thinking about it, the cart has its own gear reduction of about 10 to 1. So, top speed I would say is about 20MPH, in theory of course. I will still have to measure the actual size of the drive cogs. It may not be the fastest but it should have a nice amount of power to the wheels and the slow speed will be easier to use it on the field.
Posted 14 August 2010 - 09:27 AM
Posted 17 August 2010 - 12:10 AM
Approximately where the engine will go and the drive pulley will be forward about 4 inches more.
Due to frame clearance issues, I had to disassemble the rear suspension and will modify the linkage to allow the frame to sit lower but still have some travel.
Posted 17 August 2010 - 05:53 PM
I'm going on a trip in the morning and hope to be back in a few days to put the 1/4" notches to secure the gear. Once that is done, assembly will start moving quickly.
Posted 27 August 2010 - 12:09 PM
Progression pictures, mock up of about how it will all fit together:
This post has been edited by Orpackrat: 27 August 2010 - 12:15 PM
Posted 31 August 2010 - 11:30 AM
I don't mean to be a kill joy, but you might want to make sure you can get it insured when it all said and done. I know many scenario fields and producers require the tank be insured and they are listed on the policy for the event.