Category Archive: Metalworking

Jan 09

Making a replacement lathe leadscrew nut

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My milling machine has a #3 Morse Taper spindle. I’ve spent a few days making #3 Morse Taper arbors from steel, which I’ll use to make various tools for my mill. Unfortunately this took a toll on my lathe’s topslide screw nut. That little bronze coil spring is actually the threads from inside the nut. …

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Oct 09

All-terrain Mobility Scooter, Part 4

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Shortly after this photo was taken, Pete said “Here, hold my beer and watch this!” The first test run of the drivetrain, with the wheels up on blocks and running at half power (12V). I needed the sprocket drives for two reasons: (a) The axles coming out of the motors weren’t nearly strong enough to …

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Sep 29

All-terrain Mobility Scooter, Part 3

Brackets constructed for axle housings, clamped up ready for welding. Axle housings and mounting plates. The axle housing on the left is upside down to show the construction. This is probably massively over-engineered, but I reckon it’s better to have a kilo too much chassis than a single gram too little. The loops leaning against …

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Sep 29

All-terrain Mobility Scooter, Part 2

I’m using some thick-walled steel pipe to make the bearing housings for the rear axles. My chop saw doesn’t cut perfectly squarely, and it tends to leave swarf behind on the cut. Same housing, with the swarf filed off. The axle is only going to be 17mm diameter, so the housings will extend all the …

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Sep 29

All-terrain Mobility Scooter, Part 1

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A few months ago I decided to build an all-terrain mobility scooter for a handicapped friend. This blog series will show the machine taking shape. This is an Ortho-Kinetics Triumph Model 4390 mobility scooter, circa 1990. This works OK for Pete, but isn’t too good over boggy or bumpy ground in the paddock. I bought …

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