manual lathe slotting broaching attachment

[thehomeengineer]

Hi Johan
Thank you again for your interest and kind words.
This tool was made from stock bar the ram was 3/4” (19mm) as this is what I had to hand but it could have ended up being 1” (25 mm) or 1/2” (12 mm) as I did not make to any design and made it up as I went along. I knew the tool would only be used occasionally, as I try to always use my imperial broaching set when ever possible. So I didn’t want to spend to much time and money making an elaborate tool but something basic to just get me out of trouble. As it happens it works great and have used it quite a few times.
The actual tool was made about 25 years ago and it sits on the shelf but is a life saver. The largest keyway cut using this tool was 12mm width x 50mm long.
With reference to your build and with out telling you how to suck eggs. Try and make the ram and body as large as possible as this increase the tool rigidity and with the lathe carriage clamped to the bed stops the carriage being pushed back away from the chuck. You can only take small cuts 0.002” (0.05 mm) but it doesn’t take long to cut a slot.
I look forward to seeing your take on this build on HMT as I am sure many improvements can be made like an adjustable stop fo blind holes etc.
Many thanks again
Andy