Paul Wightman Posted January 6, 2008 Share Posted January 6, 2008 It is a long standing custom for something to be built over Christmas in these parts. My vapor build is past the need for a pipe notching tool but there will be a new rear radius arm on the market soon which requires pipe to be notched. There are assorted tools on the market which utilise a hole saw and a pistol drill but these are not the best tool for the job. In the past I have used a hole saw and a milling cutter in the lathe which was reasonably successful but a bit slow. I first thought i would buy one, one of the belt sander variety, £2000! Bu&&er that, I'll make one! Now those who know me will know I have a habit of hoarding stuff and buying cr&p stuff which will come in useful one day. I have motors, switches, steel and machining and welding to hand ,piece of wee wee I thought.......... no. It's taken almost a week to build. The motor I had, a 4kw 2800rpm 3ph monster, switch was not a problem but what to use for a drive wheel? Needed to be 250 dia 125 wide reasonably heavy, rubber faced and coned to aid tracking. To cut a long story short..... two 10" x 2 3/4" forklift tyres (which are rubber bonded to steel tube) welded together with spokes to a hub to suit the motor and the rubber machined to run true and coned. If you want to know about machining rubber I will be writing a three part novel on the subject later! The present front roller is 46 dia, this is rotating at just under 20000 rpm so needs to run fairly true, Machined from solid aluminum with quality 6200 bearings runs OK, we'll see how long it lasts. Only other tricky bit was the vice as it needed to hold round and square tube and present it, securely gripped, to the belt. The belt is a 40 grit 2000 x 125 supplied by Andrew Beattie and Co for £15. I hope to buy a quantity for less! I had a few problems with vibration to start with but it now runs fairly smoothly if not a little noisy! Capacity is 60 dia at 60 degrees and notch can be offset by packing under the vice. A guard is being manufactured now and once I am happy with it I will paint it. You may notice a pair of wheels, it's heavy and will need to be mobile. I'll post a piccy once it has a coat of paint. Quote Link to comment Share on other sites More sharing options...
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