This last because it is just about impossible to use a file to get anything flat. Hd did this with a hacksaw, some files, a Moore and Wright square, a test flat and some machinists blue - and most importantly, a scraper made from a modified wood chisel. In the distant past, before 'T' slot extrusion was popular, my father had to make up an aluminium frame from 1" square aluminium bar. Just a brief note about squaring up extrusions. **While I've got you here.what do you use to measure longer lengths precisely?Įdited 1 time(s). I really hope the ends are cut square from the factory, that would save some drama. I won't tolerate a wobbly chassis, that's no way to start the build. For starters there'll be a full ally sheet on the back and floor at least. It seems they've given it some thought, but I'll look at reinforcement as well. Yes, this kit is 2020 V slot, but there's sections of 2040 and some cross bracing. From what I found they regularly cited a better/stronger thread with the forming tap. If you're talking about tapping 2020 t-slot your joints will be tight and strong, but the t-slot will still be flexible as over cooked spaghetti.Īctually, it seems that these forming taps are the choice of manufacturers working with the old T slot extrusion. If you get about 1 cm of threads in the hole for the screw to grip it will be fine and you won't be able to strip the hole by turning the screw with a hand tool. I don't think he type of tap you use means much other than the mechanical effort required to use the tap. My hopes are I might be able to mill the ends of my vslot then plunge a tapping drill (if the extrusion hole isn't correct already) and the tap all on the machine.Įdited 2 time(s). This is a bit unusual as most Mens Sheds focus on woodwork, and it's 15 minutes from my place as well so I'm happy. I've had a stroke of luck, as our local "mens shed" (I think it's an Australian equivalent to American "Makerspace") has 2x lathes, cut off saw and a milling machine in their metalwork section. I've actually always enjoyed machining aluminium, but yes it is sensitive about lubrication/cutting speeds/tool sharpness/etc. I want the better/stronger thread enough to pay for the forming tap. Yes that's pretty much where I'm at about it. These taps are more expensive, the hole must be the correct size and of course it needs good lubrication. This method gives a stronger thread besides Al is a bitch to machine ! You are more likely to break a cutting tap in Al than in regular steel. The point here is to use an extrusion (thread forming) tap instead of a cutting tap ! They are of course not just to tap Al extruded profiles.
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