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| Tailstock tap and die holders. |
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| bogstandard:
Very nice indeed Gerhard, just like my purchased one. All these bits and pieces you are making all go to help you do even more jobs like you have done here. John |
| Gerhard Olivier:
Thanks Bogs The next bit done today is to drill and tap the hole for the grub screws to hold and wedge the die to size. I am using m5 grub screws on all of them but really the middle one should be a pointed end- so the tap can be opened to oversize if needed. Used the expanding arbour in the spin index and 3 holes 0 -45 and 90 deg and tapped with Bog-water as lube. And then made a big dent in a bag of 60 m5x6mm grub screws i got of ebay for a fiver. Next I have to dicide how to attach the holder to the holder-holder my Idea is to mill 2 small flats on the 26mm part that 2 grub screws could locate on positive. That would stop any rotation but olso prevent the parts from locking up as the grubscrew makes a burr on the inner part and preventing them from coming apart again. (exept with violence) Gerhard |
| andyf:
It's looking really good, Gerhard. Might it be an idea to turn a shallow groove 5mm wide on each 26mm part, for the grubscrews to bite into? Then, you wouldn't need to worry about positioning flats under grubscrews before tightening up. That said, I suppose flats would be better at preventing unwanted rotation. Andy |
| bogstandard:
Gerhard, I was drawing up and posting about the same time as Andy, so it looks like the same solution. Because yours are ali, you are going to have to be very careful with your choice of screws. If you can, get dog nosed, they have a perfectly flat end. Or if you use a countersink in the holder holder, which my steel ones uses, then you will need pointed. Or just drill holes thru both and let the screw penetrate into the hole in the holder holder. John |
| Gerhard Olivier:
Thanks for replies The holder and the holder-holder is made of ali -And is a really snug fit so the dimples /flats / groove would only be to prevent rotation. That makes me think that a dimple or flat would be better. The grub screws are steel and have a blunted point on the end?????? Back to the job. Tap holding a 25mm piece of steel made to size with a shoulder to locate to. The size hole drilled and reamed. Then removed and place on the spin-index and 2 holes drilled and threaded at 180 deg allowing 2 grub screws to locate to the sqaure part of the die. The part reversed and placed back in the 3 jaw chuck and reduced to a more acceptable size. This will only be possible with some of the les used taps as I use them in the lathe but also in the George Thomas Tapping tool Gerhard |
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