The manual for my Town Woodhouse mill suggested the preload was adjusted “a little”.Preload adjustment for spindles is an art, the second bearings are too tight fit to make it easy. I couldnt find if theres a factory process/method for it, or if it just needs more experience.
With my lathe spindle, a few on here suggested easing the fit for the rear bearing as they tend to jump from loose to too tight.
Clamp it in the vice on top of parallels next time and it will be infinitely easier. Avoid long hang outs like that, like the plague…I'm having a go at making some t-nuts with an M6 metric thread. From memory, the set on my mill are nominally 3/8" top slot with a 5/16ths thread.
I want the smaller metric thread so I can mount my work using holes already found in the work piece design. It needs bolting to an adjustable angle plate. There will be a sacrificial spacer to prevent the apprentice marks.
Rough dimensions measured and rounded up as the T nuts that I have seem to be a bit on the small side. I know we don't want them getting stuck, but they seem a rather slack fit.
I've bought some 16mm square bar so my bottom dimension is already done. The black t-nut sat on the bar is a shoddy Chinese one that I'm trying to replicate.
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Bar set up on the mill. There's a lot of spare material at the top that I used to finesse my cutting in from the side. The top 3.5mm will be removed so if I cut too far towards the centre it didn't matter. I used an edge finder and my DRO but still needed to make adjustments. Possibly a worn end mill or flex in my shoddy set up. I got it dialled in before I ran out of depth.
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A quick comparison as I go along. Getting there. The T-nuts are a slack fit so as long mine aren't any smaller there is plenty of leeway.
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I've milled enough material to make three. I only need two. Stick out from the vice was bad enough without trying for more. This was a fair bit of work for me. I was taking a half mm depth of cut over 3.3mm wide. Lots of passes. A bigger machine would make short work of this, but it's a bit of a slog on a small mill.
Just need to cut in the bandsaw, drill and tap.
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...a Stockton crack-hooker.
I keep meaning to make some T-nuts...
causing the roll to fall out at the worse possible time.