Enlarged rocking engine build

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kayz1:
I was going to say come and use my mill if you want,,,,then i looked at your profile ***
Lincoln bit of a treck that..
Lyn. PS: kep up the good work, i am learning a lot here for when i TRY to do some thing like this.

Ross:
Hi everyone,

I got quite a bit done today, I took the aluminium plate down to size using the four jaw on my lathe.

Then I marked out the holes on the plate.

And then drilled.

And then I marked out and drilled the holes in the bottom ad tapped M4

And then I rubbed the faces and sides down with sandpaper to remove the marks etc..

And loctitited the bearings in the holes flat.

And while that was drying I turned and finished the crank shaft diameter.

NickG:
Wow, you're flying now mate - can't believe I didn't think of using the 4 jaw! :thumbup:

Ross:
Hi everyone,

I've taken another few weeks off on this but I've been busy doing a couple of bits and pieces to my lathe, I've fitted a new guard and a lamp which I made, the light makes a world of difference.

To test it out I had to turn some sleeves for the I/D crank wheels due to me stupidly ordering 5mm bore bearings and drilling the crank wheels to 6mm

I turned he O/D to suit the bore of the wheels and then drilled the bore 5mm and parted off two parts. there isn't much material in it and I thought it was going to all end in tears, but I'm pleased with the result. Just a couple of holes to drill for the grub screws to slot through.

Ross:
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

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