Right, so I've been looking at wheelbarrow-sized wheels and similar.
I haven't yet found anything suitable (in the local skips etc!) to use as an axle, though.
This is one I made earlier for moving materials down a very steep garden, 45 degree slope for some of the drop
Swival casters at the front and wheels on a rod axle at the back to cater for the steel slope. 12 mm plywood and some 2 by 2 timber
Worked but needed two people, one to steer it and the other to control the speed control by feeding the rope.
On Saturday I went to Screwfix and bought some wheels. They have a couple of different types of large wheels; the black and white ones are just wheels but the red and black ones include a bearing in the hub, making them easier to use. I bought a couple of these 200mm ones:
I had a bit of 20mm steel conduit which they fit perfectly. I couldn't really find anything suitable to secure the ends with though; I tried hammering on a 1/2 inch plumbing fitting and it seemed solid until I actually tried using it.
I fitted the wheels to a piece of plywood from a skip, chosen to suit the width of the path to my front door.
The first use was this morning, for a timber delivery. I had been trying to get 3m lengths but I could only get hold of 4.8m, which made thigs more difficult; these wheels are fine for these cobbles but the timber was too close to the ground.
Next time I get timber I'll try to lift it further off the ground somehow, and also work out how to push or pull it from higher up.
I'll add some sort of uprights for the plasterboard delivery.
I had a bit of 20mm steel conduit which they fit perfectly. I couldn't really find anything suitable to secure the ends with though; I tried hammering on a 1/2 inch plumbing fitting and it seemed solid until I actually tried using it.
Somewhat off topic as it's a different usage completely but here's one of two dollies I've made this week for tool cases. Painted them with water based primer and gloss since just to tart them up a little. Ply was out of a skip and casters were £9~ a set of 4, 2 locking rated up to 200kg off Shenzhen special eBay.
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