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  1. B

    Switched to a GNG style "big block" swingarm coming soon!!

    No, the cheaper FW is better than having to hold off on the project. If you held one of the HDs in your hand you might think twice though. They kind of exude quality and are definitely not your common Chinese FW. They are American made, real seals, and replacement parts are available. bØb
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    Switched to a GNG style "big block" swingarm coming soon!!

    The FW is right hand threaded. It is screwed on a 5/8" bore adapter on the BB cartridge shaft. I turned the hub on the left pedal crank down so it would fit up in the non threaded portion of the front FW. This allows the FW to sit very close to the left pedal crank. The FW is not driven by the...
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    Switched to a GNG style "big block" swingarm coming soon!!

    HD Front Freewheel & 5/8" bore FW adapter (right hand threads). Threads on FW adapter needs to be shortened because they bottom in the Front FW adapter. All available from sickbikeparts.com . The pedal cranks and BB cartridge are also available from SBP. bØb
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    Switched to a GNG style "big block" swingarm coming soon!!

    That will eliminate most of the torque induced squat and you will have no chain length issues. BUT, your internal gear ratio will go back to 5:1, you loose the ability to shed more heat from the stator, you will loose some throttle response because the motor housing is now a flywheel, the motor...
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    Switched to a GNG style "big block" swingarm coming soon!!

    Of course if you are dealing with flat surfaces, you can always "7P" rivet them together. bØb
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    Converting a hubmotor to a middrivemotor

    Why not just put some 271 Loctite on them and just try it. You might be looking for a solution that doesn't have a problem :roll: bØb
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    Converting a hubmotor to a middrivemotor

    It kind of depends on what you are looking for. For all out performance the 6T or 8T would be best. BUT if you are looking for best efficiency or range, I believe the 12T MAC would be better. I think gearing for the highest speed desired for the street is the best plan. If you insist on gearing...
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    Converting a hubmotor to a middrivemotor

    Green Machine, "I think" this post http://endless-sphere.com/forums/viewtopic.php?f=28&t=46568&p=684647#p684647 on a different thread will answer your question and tell you what effects the clearances in the MAC motor conversion. In my conversion the only shim I used was a very thin shim...
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    Switched to a GNG style "big block" swingarm coming soon!!

    If you use a slack side idler, it needs to be on the frame. The slack side idler need not be anything more than a dérailleur sprocket. If you have trouble getting a idler big enough to go around the SA bolt, you might try using a FW and remove the ratchet paws. I think I found some hub-less FW...
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    Switched to a GNG style "big block" swingarm coming soon!!

    Just move the motor to where you proposed and add the idlers. Mount the motor as far back as you can and still miss the 1 piece SA bolt. The idler should be around the SA bolt and the tension side of the chain passes over it. Just make sure that the chain still has a little bend in it at full...
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    Switched to a GNG style "big block" swingarm coming soon!!

    How about putting a tension side idler around the swing arm bolt and mount the motor as close as possible to the SA bolt. Position the motor vertically so that the chain is almost straight at full compression to minimize losses. If necessary put a slack side idler close to the motor to insure...
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    Switched to a GNG style "big block" swingarm coming soon!!

    Sometimes it can be hard to wrap you head around :roll: When you convert the motor to shaft output the brake side becomes your new right side. This is the beginnings of an adapter to hold 2 chainrings and a FW on the brake (new right) side of the motor. I will post a picture of the completed...
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    Switched to a GNG style "big block" swingarm coming soon!!

    The sprag clutch in the motor disengages everything in the motor. It should be very easy to turn the shaft in the direction of rotation with your fingers. If you can't, you have got something wrong. I can spin mine with my fingers and it will spin about one additional turn. It would turn more...
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    Converting a hubmotor to a middrivemotor

    I present you the LOVEJOY sprocket :lol: The front half is made with the sprocket free to rotate on the hub and the back half is keyed to the shaft with an elastic spider between the two halves :roll: Not available anywhere, because they don't work :mrgreen: bØb
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    Switched to a GNG style "big block" swingarm coming soon!!

    I suspect that your spacer is too thick. Or there is a difference between older MACs and newer MACs. My spacer had to be 0.671" thick. My MAC is the newer one with holes in the rotor, new gray gears and even tough it did not have the newest clutch, I built it with one that I had bought...
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    Switched to a GNG style "big block" swingarm coming soon!!

    How thick did yours turn out? Have you assembled it yet? Now if you can circulate water through the bike frame :roll: bØb
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    Who's got the junk yard dog eye? & structural question

    Don't underestimate wood. There are a lot of wooden airplanes out there. Might I even mention HH's Spruce Goose. bØb
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    LACEY Dropouts-WTF?

    You have to consider also that even if you start with 6061-T6, it will loose >50% of it's strength unless it is re haet treaded after welding. bØb
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    LACEY Dropouts-WTF?

    You can guess at engineering reasons, but if you really could get an honest answer out of the manufacturer it would probably be: #1 easier to weld, #2 looks cool. When you try to weld a heavy fixture to a thin tube, you have trouble getting the fixture hot enough without burning through the...
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    Who's got the junk yard dog eye? & structural question

    Kinda concerned about the weight. Your design could be made from plywood and be more rigid with just a fraction of the weight. Think top and bottom of 3/4" plywood cut on the inside to allow bending, then fiberglassed to add strength. Sides could be 1/4 " plywood. Make the rear drop outs from...
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    Switched to a GNG style "big block" swingarm coming soon!!

    12 screws and less than 1 minute can take the converted to here: You really only need the circlips on both sides of the clutch. What ever sprocket or adapter you use on the brake side should be pull the clutch circlip up against the bearing inner race. That way the bearing takes care of axle...
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    Converting a hubmotor to a middrivemotor

    In a nut shell: 1> Run the motor before you take it apart and void the warranty :wink: You can hold the motor vertically or horizontally in a vise by the brake axle flats. 2> Remove nuts and etc from both ends of the axle. Clamp the brake side axle vertically in a vise. 3> Remove the freewheel...
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    Converting a hubmotor to a middrivemotor

    That big bearing in the stator holder of a MAC is NOT an axle bearing. That hollow shaft that is in the bearing I.D. is part of the sun gear/rotor. None of that ever touches the shaft/axle. I have posted several times telling all: If you connected the wires up and supported the motor by the...
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    Converting a hubmotor to a middrivemotor

    WOW, I'm blown away by that. I bought my MAC about a month ago and ran it off and on for about an hour. I then disassembled it and was impressed by the design and workmanship in it. At my age and with all the things I have seen, I'm not easily impressed. My only possible negative comment would...
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    Converting a hubmotor to a middrivemotor

    I think you are going to find out the MAC is a different animal :roll: Search for the posts I have made to this thread and you will see some of the differences. bØb
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