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I am looking for a way to spin a peice of 1-1/4" and 1-1/2" diameter tube in a drill for polishing and beveling the end. Something that either fits inside and expands or something that grips the outside. Does anyone have any idea's. I have thought of a 3 jaw lathe chuck but those are expensive and I am not sure it could be made to work. I have also thought about those drum sanders that expand when tightened but have not found one in the right diameter. The tube size is 1-1/4 and 1-1/2 and I need to spin them to be able to get a machined bevel and to be able to polish them. Any idea's?
Reply:Tailpipe expander or lathe with three jaw chuck. More details?
Reply:If you're doing this in a drill press, you can have a tapered piece of the correct diameter, either made of plastic, hardwood or such, which slips inside the top end while the lower end has a similar tapered piece which rides in a bearing so the piece can rotate. Friction will cause the piece to turn with a small pressure from the quill; this will work well for polishing, but with such a mild drive, for beveling you might need a jig with a lathe tool that can be advanced by screw so only a controlled cut is made. The jig should be bolted to the drill press table.Finding someone with a small lathe would be so much easier! I thought everyone mechanical needed/had one!
Reply:How long are the pieces you want to spin? How accurately do the pieces have to spin? Are you using a hand held cutter, like a file or an angle grinder or a hard-mounted tool as in a lathe to bevel your tubes? I gather that you have a drill press, but not a lathe, and since you mention using a drill press, I assume the pieces are short and precision is not critical. What kind of spindle does your drill press have?The best device for this kind of task is a lathe. You can turn an expanding mandrel or collet that runs true even if your chuck has excessive runout because you don't remove the collet from the lathe until you finish the job. I turned several tubes for optical devices using this technique and it worked very well. I turned the mandrel to be a snug slip fit inside the tubes and expanded the mandrel to grip the tube by tapping a tapered plug removed from an expanding concrete anchor into a hole drilled through the mandrel. It's important to drill the hole all the way through the mandrel so you can tap the tapered plug out with a long rod inserted through the headstock spindle. The mandrel was slotted with two cuts at 90 degrees using a hacksaw without removing the mandrel from the lathe after turning to size and drilling. The slots allow the mandrel to expand to grip the tube when the tapered plug is tapped in.If you only have a drill press it is going to be hard to get the exact O.D. you require on an expanding collet, but you might request that the manufacturer or a friend with a lathe turn a machinable collet to size for you. As examples of what's available, look at the expanding mandrels/collets here:http://www.dunhamtool.com/expanding_mandrel.htmlAlso, google, "expanding mandrel" to see what's available (217,000 listings). Dunham's expanding mandrels have a 3/4" shank for the O.D. you would require. Does your drill press have a chuck that can accept a shank that large? You might be able to find an expanding collet that fits your drill press spindle. Ask the manufacturers.Good luck.awright
Reply:how about one of those expanding rubber freeze plugs{from the auto parts store} of the correct size chucked up in the drill motor?
Reply:sprinklerhead is headed in the right direction......you can get sanding drums that mount on rubber that is retracted to install new ones and expanded to hold them in place.......home depot has them....they have a 1/4" end so it can be mounted in your drill press with no problem..... |
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发表于 2021-8-31 22:49:16