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kevinloh
Apprentice
Brunei
121 Posts |
 Posted - Dec 23 2003 : 8:04:28 PM
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I have four wheels (you know the shopping cart wheels) but I do not know whether it can be made as a gokart wheels. The only problem is linking the power from the engine to thew wheels.
(Edit....Move to Vehicles)
Edited by - Aaron Cake on Dec 26 2003 4:14:03 PM |
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Dec 23 2003 : 9:25:56 PM
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not only that, but they would be hard to link to a stearing system.
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n/a
DELETED (Inactive)
56 Posts |
Posted - Dec 24 2003 : 8:23:00 PM
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I'm not sure those wheels are made for high RPM's. I'm assuming that the shopping cart wheels either include bushings, or cheap bearings.
Also, the hard plastic/rubber that is used in the casters can get loud, and wear more quickly, especially on a go cart.
Maybe you can make a rolling support frame, so that you can roll around heavy objects. Just make a square frame out of 2x4's and attach the casters.
Or you can make a rolling TV stand.
Or you can machine grooves in the wheels and use them as pullys for some sort of rope mechinism.
Or you can make some really ugly roller blades.
Maybe you can use the wheels to build a generator. Find some way to wrap magnet wire around the wheels. Then build a frame around the wheel and attach magnets. Maybe you can get it to light a small light bulb or LED.
etc. etc.
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kevinloh
Apprentice
Brunei
121 Posts |
Posted - Dec 25 2003 : 12:53:49 AM
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The explanation :
I am planning to use a high quality door (the hard and thivk one) as the frame. And yes even as a wheel barrow if I pushed it to fast it will make a loud sound. And to rotate it to 360 degrees it has numerous bearings. The wheels are made of hard rubber.
The plan:
My plan is to build a go kart with it regardless of the amount of sound it made. I have 4 wheels together 2 of them can be rotated 360. and two of them are welded together so it is used for the back and cannot be rotated, only front and back.
The idea is to use an engine hopefully briggs and Stratton 3.5Hp that costs BND$280.00 around US$160.00 with horizontal shaft and to use a belt to drive the wheel.
The steering system would just consist of a metal bar to turn to the right just push the bar to the right since the wheels can be rotated easily with the help of lubricants and ball bearings.
Lastly, I am in doubt about the lawn mower engine I think most have automatic clutch meaning if the blades/shaft is obstructed by something the engine would idle and not continue to move the blades/shaft. Does the Briggs and Straton 3.5Hp engine for the lawnmower like Aarons has manual or automatic clutch since most engine such as Maruyama has automatic clutch.
Replies, Ideas and Explanations are welcome
Edited by - kevinloh on Dec 25 2003 12:57:54 AM |
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Dec 25 2003 : 5:42:57 PM
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Use a jet engine. That way, you can just use the thrust and not worry about hooking up the wheels, or you can have the engine drive a single large wheel in the back.
There is hope in the Future... |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 26 2003 : 4:20:59 PM
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I would give up on the shopping cart wheels. They are totally unsuitable. For a go-kart, you need pneumatic wheels.
The clutch is a seperate part. It does not come with the engine.
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kevinloh
Apprentice
Brunei
121 Posts |
Posted - Dec 26 2003 : 8:06:19 PM
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I thought that all the Briggs and Stratton Lawn Mower Engine have automatic clutch?, for example if the blade hits a large rock the engine will idle and will not continue to spin the blade unless the obstacle has been removed. This is to prrvent serious injury. How do you link your manual clutch to the engine then?
Replies are welcome
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 27 2003 : 11:16:59 AM
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No. Vertical crankshaft lawnmower engines don't have any kind of clutch on the blades. They are directly bolted to the crankshaft. The only protection you have is your own common sense, and a shear-pin on the end of the crank.
Since we are talking about lawnmower engines, I assume you are talking about a vertical crankshaft engine. You cannot turn it on it's side to make it horizontal.
The way the clutch attaches is different based on the type of the clutch. Typically, manual clutches bolt onto the shaft, and then have another actuating arm that attaches to where the engine is mounted.
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kevinloh
Apprentice
Brunei
121 Posts |
Posted - Dec 28 2003 : 9:06:57 PM
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May I ask what is the 'shear pin' ? And,how do I make the engine of the vertical shaft idle and not moving the blades although the engine is on? And this the blades of the vertical shaft engine won't stop in an event of obstructions such as rocks, unless some lever is push down or up?
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 29 2003 : 09:40:27 AM
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I used the wrong name. Shear pin is techincally the wrong description. What you have on the end of the crankshaft is a hub to which the blades are mounted. The hub slips over the end of the crank and is normally bolted from below with one large bolt. A shear key sits in a groove in the crank and hub to keep the hub from rotating (look at any keyed shaft arrangement and you will see). In the event the blades suddenly stop, that key shears in half and allows the engine to gracefully stall and slow down. Bear in mind that the crankshaft is VERY hard, and damaging it is virtually impossible through normal use. I have only ever seen a few bent shear keys. Thus, there is no need for a clutch. The blades also serve as a counterwieght for the flywheel, so "clutching them out" may prevent the engine from idling.
To idle the engine without moving the blades, you need a clutch.
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kevinloh
Apprentice
Brunei
121 Posts |
Posted - Dec 29 2003 : 9:29:32 PM
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Ok so how can I create the vertical shaft engine idle and not moving the blades/pulley, does the clutch include when buying a vertical shaft engine or you have to assemble it yourself?
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Dec 29 2003 : 10:50:55 PM
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You can buy centripetal clutches (automatic) from most go-kart supply stores. If you want to build one, put a v-belt pulley on the engine, another on the output shaft, and another pulley on a movable linkage to take up slack on the belt to engage the output shaft. I would use the centripetal. It can transmit much more power than belts.
There is hope in the Future... |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 30 2003 : 10:06:02 AM
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My question is why do you want to idle the engine without moving the blades?
If this is for a go-kart, stop right there becuase you are using the wrong engine.  Vertical shaft engines cannot easily be used without some kind of 90 degree gearbox. You can't just put the engine on it's side.
If you REALLY want to idle the engine without turning the blades, you will need three things:
1. Heavy flywheel. Replace the stock flywheel with the cast iron unit from an equivelant sized horizontal crank engine. This will allow the flywheel to store enough momentum to keep the engine rotating during idle
2. Get a centrifugal clutch. Any farm supply store or small engine shop.
3. Figure out how to mount the blades on the clutch. This is a nonstandard arrangement, so you're on your own. The clutch will have a sprocket or pully on it, but no shaft on which to mount the blades...
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gokartmaniac
Apprentice
Germany
105 Posts |
Posted - Dec 30 2003 : 8:33:58 PM
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Plans for:
The Most Basic Wooden Kart
This kart is very simple to build, and the detailed plans don't have to be adhered to strictly as there is plenty of scope for individual flair and ideas when it come to the making and building of this kart. The first link on this page gives a general picture/ plan of the kart complete with the engine and seat. The rest of the links are to detailed parts of this kart such as the steering, brakes and axles. The plans are in some places a bit hard to follow but effort has been put into the writing and explanation of each drawing.
This Kart is more focused on using a common Lawnmower engine and on driving this simple and basic kart. It has to be pointed out though that this really is a crude enough kart. Steering is through the use of ropes as on a "soap box kart" or any push kart or the use of one's feet to turn the front steering axle. Brakes are very simple and basically taken from any bicycle and adapted to fit the smaller wheels on the kart taken ideally from a child's bicycle or "pram wheels". I cannot say how long one of these karts will last, either under normal running or under punishment and "dogging".
Also, this Kart is not really that safe. Precautions should be taken when driving this kart, this kart is light enough and with incorrect gearing it may go too fast!, overturn etc etc etc etc etc etc etc.
Look here for a rough plan of the layout and appearance of this basic wooden kart:
Plan of Wooden Kart
The building of this kart is split up into sections and is in order as in the building of the actual kart.
First:
Main Chassis/ Frame
Second:
Front Axle
Third:
Rear Axle
Fourth:
Brakes
Extra Page:
EXTRA PAGE COVERING THE MAKING OF THE CHASSIS. - explains making the chassis and also covers the positioning of the engine and the setting up of the belt and pulley drive using a typical lawnmower engine.
Fifth:
Engine Mounting and Fitting
Sixth:
Controls and Levers for brakes accelerator.
Seventh:
Drive and Linkage
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Details and Graphical Assembly Instructions on a similiar wooden kart can be found in:
"Other Peoples' Karts"
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Return to the Main Kartbuilding Website
Seth A. Meredith |
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cirvin
Nobel Prize Winner
USA
1542 Posts |
Posted - Dec 30 2003 : 9:13:53 PM
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Ohhh. It uses a belt turned 90 degrees. It uses a tension pulley to take up slack and engage the drive.
There is hope in the Future... |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 31 2003 : 09:04:02 AM
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Not sure where that text comes from, and since you can't copy-paste graphics into a forum, I can only assume that as cirvin said they use a belt twisted 90 degrees.
That's a decent arrangement, but don't even think about using the belt as a clutch unless you want to replace them every 10 minutes...
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Any ideas ?!?
