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Father-son project: need advice
 Moderated by: Kevin Gagne Page:  First Page Previous Page  1  2   
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 Posted: Mon Aug 28th, 2017 07:10 am
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Doug Tenney

 

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Mana: 
Looks like Mark nailed it.
I'll measure what length axles we use and update this post.
Be sure to order some split locking collars to keep the axle from sliding slide to side.  If the bearings have set screws for that purpose, don't use them, because they'll raise a burr on the axle, making it impossible to take apart or even shift things around later.
Also, buy some lengths of 1/4" square keystock.  Rather than using individual keys, which can shift and fall out, use a continuous length of keystock for each item, so it can't shift.  Tuck one end of keystock inside the axle bearing, after grinding a small relief in it.

Individual keys can walk out.  That's a nuisance if it's the key for one of the wheels or the sprocket hub, but a catastrophe if it's the key for the brake durm.

Doug

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 Posted: Mon Aug 28th, 2017 03:41 pm
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Kelvin Callaghan

 

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Will do Doug!

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 Posted: Mon Aug 28th, 2017 04:39 pm
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Doug Tenney

 

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This is probably obvious, but just to be clear:  Grind (or file) a little step in the key, so that it tucks inside the bearing ID for the last 1/8" or 1/4" of its length.  Don't grind the bearing!  Trick I learned from Carl Haydt.

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 Posted: Wed Sep 6th, 2017 01:54 pm
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Kelvin Callaghan

 

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So we did a little test fitting the other day, and the kart is a little big for the boy. Despite the grin on his face, he complained that his legs were pressing into the steering supports.

Attachment: IMG_20170826_111235.jpg (Downloaded 93 times)

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 Posted: Wed Sep 6th, 2017 01:55 pm
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Kelvin Callaghan

 

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This setup is better for him, but I am not thrilled with the leg position.

Attachment: IMG_20170826_112059.jpg (Downloaded 92 times)

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 Posted: Wed Sep 6th, 2017 01:56 pm
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Kelvin Callaghan

 

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If I put the pedals on the way I think they are supposed to go -he can't reach them.

Attachment: IMG_20170905_215932.jpg (Downloaded 91 times)

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 Posted: Wed Sep 6th, 2017 02:06 pm
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Kelvin Callaghan

 

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If I reverse the pedals, they are kind of wonky. I would definitely need to add some stops to keep them from falling too far down. So, at this point I am think about getting these from BMI -they look closer to what is on the orange sears kart pictured earlier in the thread. Any sage advice or thoughts appreciated.

Attachment: Capture.PNG (Downloaded 90 times)

Last edited on Wed Sep 6th, 2017 02:41 pm by Kelvin Callaghan

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 Posted: Wed Sep 6th, 2017 05:11 pm
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Doug Tenney

 

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Hi Kelvin.  I wonder if the pedals from BMI are actually from Azusa.  Azusa seems to own the market for kart and mini-bike components.  They're probably worth a try, although experimenting can get expensive.

Don't let your son drive the kart with his legs going through the steering hoop.  For the same reason nobody wears a seat belt on a motorcycle... when things go awry, you and the kart need to be able to go your separate ways.  Knock on wood, hasn't happened to me... yet!

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 Posted: Wed Sep 6th, 2017 06:15 pm
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Kelvin Callaghan

 

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Doug Tenney wrote:

Don't let your son drive the kart with his legs going through the steering hoop.  For the same reason nobody wears a seat belt on a motorcycle... when things go awry, you and the kart need to be able to go your separate ways.  Knock on wood, hasn't happened to me... yet!


Yeah, I think we need to make it work with the legs on the outside.

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 Posted: Wed Sep 6th, 2017 10:09 pm
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Kelvin Callaghan

 

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Okay so I am trying to figure out the band brake. I think the setup on the left is the correct way -can someone confirm? Also it looks like I should have a 4.5 inch drum to better fit.

Attachment: band brake.jpg (Downloaded 83 times)

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 Posted: Wed Sep 6th, 2017 11:20 pm
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Doug Tenney

 

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I'm not sure, but consider this:

Assuming that the front of the kart is toward the right:
In the view on the left, the braking friction will tend to tighten the band.  That's called the Servo effect.  That effect is put to use in automatic transmissions to make the band grab tight to complete the shift.  Not necessarily a good thing for a brake.

In the view on the right, more pedal pressure will be required, but without the Servo effect, there won't be a tendency to lock up.

I think you're correct in picking the view on the left.  But if it locks up too easily, go with the other choice.

Last edited on Wed Sep 6th, 2017 11:34 pm by Doug Tenney

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 Posted: Thu Oct 5th, 2017 04:12 am
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tech54K

 

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I want to do this project too!! Thanks for sharing this.

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 Posted: Wed Jan 17th, 2018 03:53 am
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Karty

 

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Nice build! I'm wondering if you got any tips for the fenders. I found a homemade Go Kart / Reverse Trike Build on Youtube that fabricated the front fender flares. Do you recommend using flat stock and 20-gauge steel on that?

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