Member postings for Nishka

Thanks for the replies.

Not sure about casting a 'blank', wouldn't I need to add draft to the hex core in order to allow it to release?

If I could find a way to put a 1/4" hex into the end of a 'blank' then that could be turned down to the required end product. The blank would be at least 2" long and have a dia of about 3/4"-7/8".

Would drilling the blank with a 1/4" pilot hole (or maybe slightly larger - 6.5mm), allowa hex to be manually broached?

These parts are actually reproductions of 3/4" dia switch knobs that where originally made from Bakelite.

Edited By Nishka on 26/10/2014 18:38:38

Thanks Bernard.

The Hex would need to be at least 75% of the depth so 5/8" may well (just) be enough. I am however, struggling to understand how I could get a larger dia hole beyond the 5/8" hex in the bottom of a blind hole, but then I'm new to all this and finding most of it a struggle!

I need to produce a 1/4" AF Hex blind hole in the centre of a 7/16" Dia Polyester Resin rod to a depth of 13/16". Does anyone have any suggestions as to how to achieve this?

I appreciate that there are many ways to skin a cat and that some ot the methods available may be more suitable than others. I assume that rotary broaching is out due to the dia/depth ratio.

Is making a broach from a hex/allen key suitable for PR? I need to make a lot of these (300-500 pcs).

Thanks in advance