Hi everyone,
Today I started roughing out the support posts that will go between the engine frame and the base.
I have to make 5 of these so I changed the design to keep it simple and so there less margin for error.
Here is a rough drawing, I left the diameters off as I didn't have the measurements on hand. I'm trying to use imperial measurements more and more, but all the threads are still in metric!
Firstly I parted each post off and roughed out the thread length at the top. This varied slightly per part so I could keep the length of the body the same.
I left the main body of the posts .300" long for ease of clamping.
I drilled the 4.2 mm holes in the bottom of each post for the M5 Thread.
And then I started to turn the O/d of the thread length I marked out previously to 4mm and threaded.
From here, it all goes downhill.
I decided to face the first off to length - .500" and it was all going well as it should. I turned the top half O/D of the part down to 6.25mm.
I went in for the finishing cut of this O/D and was just winding out at the back face when I accidentally knocked the feed on. The part partly sheared out of the jaws and the cutting tip of the tool snapped off. Sadly this mangled the part and the tool beyond repair.
I continued on with the next part and did the above, I was using a new tool and I was having major problems with the clearances as it was rubbing while I was facing it to length. It works fine when cutting the O/D's though. The tool I'd broke worked I'd never had a problem with the grinding clearances but I really can't get the hang of grinding these bigger tools.
I've left it for now as I didn't want to go scrapping all the rest off because of badly ground tools. Maybe a interchangeable tip tool would be a good Christmas present?! But I'll see what you guys think.
Ross