• If you are new to GiantScaleNews.com, please register, introduce yourself, and make yourself at home.

    We're 1st in Giant Scale RC because we've got the best membership on the internet! Take a look around and don't forget to register to get all of the benefits of GSN membership!

    Welcome!

Mini lathe (and mill) discussion.

Worked on modifying my carriage stop for my application today.
 

Attachments

  • Stop2.jpg
    Stop2.jpg
    667.5 KB · Views: 72
  • Stop3 (2).jpg
    Stop3 (2).jpg
    662.3 KB · Views: 102
Machined out a deeper jaw for my drill press vise. It's now over the top of the crap groove so I can use my parallels on the vise.
 

Attachments

  • vise2 (2).jpg
    vise2 (2).jpg
    583.9 KB · Views: 80
  • jaw (3).jpg
    jaw (3).jpg
    643.5 KB · Views: 83
  • vise1 (2).jpg
    vise1 (2).jpg
    479.9 KB · Views: 83

TonyHallo

150cc
A friend bought an Aeroworks 100cc Extra with a 3W 150CS mounted on it, it's quite ballistic. When he got it home he discover the engine back plate had been welded, buyer beware. He had the plane out 4 or 5 times last year and every time the left muffler would come loose. He also found that on the left cylinder someone had enlarged one of the mounting bolt holes, this was drilled crooked and tapped for 1/4-20. Oddly enough I found the other hole had a insert that is tapped for 8-32. I removed the right side muffler and found both holes have inserts and tapped for 8-32.
The cylinder was setup to the mounting flange and the 1/4"-20 hole was drilled out with an 1/4" end mill and then enlarged to F drill size for a 5/16- 18 thread, a steel insert was installed and drilled and tapped for 8-32. The muffler flange was skim cut, I found the 8-32 insert was proud of the flange, it isn't any longer. I didn't tap the hole completely through so the the insert would bottom in the threads, it was also installed with Loctite retaining compound.

IMG_2565.jpg
IMG_2562.jpg
IMG_2563.jpg
IMG_2564.jpg
 

TonyHallo

150cc
It looks bad but it is a great running engine. The mufflers were both skim cut to remove the exhaust port impression, the left muffler was fixtured in a piece of 1" x 2" x6" steel bar that serves as my 1/4" music wire bender. The spot faces were cleaned up and steel inserts were made that fit into the 1/4" hole.
IMG_2567.jpg
 

TonyHallo

150cc
It's a good time to have a look inside a 3W CS engine and see what changes are made. All the bypass ports are polished to a near knife edge, there is some polishing in the exhaust port and I was surprised to find a hemispherical combustion the camber. The pistons have a slight crown

IMG_2568.jpg
IMG_2569.jpg
IMG_2570.jpg
 
Top