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  #121  
Old 10-21-2019, 02:19 AM
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Nice work! I can't remember if you were going to have a roll cage or not. If not, I wouldn't use seatbelts at all
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  #122  
Old 10-21-2019, 04:07 AM
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Nice work! I can't remember if you were going to have a roll cage or not. If not, I wouldn't use seatbelts at all
This is interesting. I have been back and forth on a roll cage and haven't decided - but leaning towards not having one. My thoughts are that teh kart will be wide and low and not lend itself to any type off off road driving. Hence the likelyhood of a roll would be very low. A crash on the other hand could happen and hence I am planning seat belts.

Of coursse my kids are gonne be the ones driving this thing so needless to say, safety comes first.

What is your though process regarding not going with seat belts if not going with a roll cage?

Do I need to rethink this and go with a cage?
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  #123  
Old 10-21-2019, 07:11 AM
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Basically, if they're buckled in without a cage, they won't be thrown from it, but the weight of the vehicle on top of the could very well snap their neck.
I posted a pic somewhere on the forum recently(can't find it) of a race kart upside down in mid air, and the driver had been thrown out of the seat and was basically laying down in midair instead of having his scalp pointing towards the ground.
Cage=belts
No cage=no belts
Even if it's a good roll bar with seatbelts, it's better than nothing.
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  #124  
Old 10-21-2019, 07:21 AM
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Quote:
Originally Posted by Allracing View Post
This is interesting. I have been back and forth on a roll cage and haven't decided - but leaning towards not having one. My thoughts are that teh kart will be wide and low and not lend itself to any type off off road driving. Hence the likelyhood of a roll would be very low. A crash on the other hand could happen and hence I am planning seat belts.

Of coursse my kids are gonne be the ones driving this thing so needless to say, safety comes first.

What is your though process regarding not going with seat belts if not going with a roll cage?

Do I need to rethink this and go with a cage?
Generally, this is how it works:

If you don't have a rollcage, you would rather want to be thrown free from the kart. If it flips, you do not want to be strapped to the kart and crushed underneath. You would rather want to be thrown free. Look at all the gokart racing guys. They don't have any belts......and this is for that exact reason.

If you do have a cage then you will want belts so that you are kept inside the cage if the kart rolls. You do not want to fall out and have the cage pin you down. People often also install arm restraints so that your arms cannot reach out the cage for them to be crushed in case of a crash
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  #125  
Old 10-22-2019, 07:09 AM
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Thanks for the insight on rollcages and seatbelts guys, I hear you and realise that I will have to revise my plan! To be comfortable I feel that I need to go with at least a roll bar and belts. Need to think about a solution that will be safe and hopefully can blend in with the visual concept


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  #126  
Old 10-23-2019, 02:03 PM
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Default Wheelbarrow hot rod

It was time to start looking at a drive shaft On the differential side, it needed to connect to this:






And on the engine side it needed to accomodate this 22T sprocket (as per earlier discussions on drive ratios ):





In addition, the shaft needed to be supported by bearings on each end.



I started on the differential end and thought about just sticking a round shaft into the pinion splines and welding it solid, but decided to try and make a splined shaft end that would fit.



Ideally this would be done on the lathe, but I have no means of controlling shaft angle on my lathe - so it had to be done on the mill. the mill would make for a less rigid setup and it would severly limit workpiecfe length but I got after it anyway:



I ground a tool mimicking the spline form:






Then sat it up like this (spline tool is in a boring head to control depth of cut):













(Latter couple of pics are with a 2.0 version of the spline tool - first version was flexing too much)

Result:







the result is crude due to set up not really being stiff enough, but it actually fits pretty snug in the pinion. I am confident it will stand up to the limited tork output from the 6.5HP engine



More drive shaft stuff to follow
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  #127  
Old 10-24-2019, 02:55 PM
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Default Wheelbarrow hot rod

More driveshaft fun



I did some work to the engine side of the shaft. As mentioned, I had bought a 22 tooth sprocket for this side that needed to fit. I machined up a short stub axle fo rthe purpose, much like what was done on the diff side:











Next I focused on the shaft supports. I thought about getting some pillow blocks but decided to use some ball bearings I had laying around and machine some blocks myself out of aluminum:












I now had shaft supports and shaft ends and all I needed was a shaft I went with some 1" mild steel tubing. The two ends was welded to the shaft and bearing surfaces including bearings shoulders were machined each end:









Finally I had this:











The bearing blocks will receive some more machining, just have to figure out exactly how to hang this bad boy on the kart
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