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Thanks ttmrj! We've added your T-Nuts to our Machining category,
as well as to your builder page: ttmrj's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-t-nuts-4"> <img src="/uploads/234914/homemade-t-nuts-4.png"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-t-nuts-4">T-Nuts</a> <span> by <a href="https://www.homemadetools.net/builder/ttmrj">ttmrj</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/holding'>holding</a>, <a href='https://www.homemadetools.net/tag/mill'>mill</a> </div> </div> </div> </div>
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Thank you, very much appreciated
I understand your frustration. Making and threading holes is harder than most people think, especially when thousandths matter. Making and threading the holes first is a good strategy to overcome that difficulty because you can then accurately machine to the threaded hole locations.
When you can make things anyway you desire, do so.There are features commercial tools will never get, DIY opens that door.
I don't mind them tapped thru. Set narrow side in vise against a stop, and clock that for center line, long as they are close to equal width. However, this second operation can bulge the size enough to not fit slot anymore. Vise-held keeps that under control.
If you tap first, do them in pairs, triplet or more in length. Mill them into central not on parallels, but 2 equal size small drill blanks in the holes, and punch mark one side beforehand to keep track.
Make some as long as possible that still fit coolant trough. They have room for more than one thread size; very handy.
Total height ~.030-.050 shallow of flush, so they don't protrude as the stud pulls them up. Gage from corner edge, overall height is rather inconsequential.
A good chamfer on the bottom 4 sides & corners, and 4 corners of the actual 'T' makes life easier, lower edge just broken; functioning as partial T-slot cleaners.
It's worth sliding each ALL the way through each slot. Previous users of the machine could over tighten hold-downs and burr inner edge of slot.
No commercial T-slots are made to fit better than you can DIY, but casehardening or heat treatment is one advantage they have. Plenty of us do that too...