Well then, really off topic...

Ron Wood · 01-22-2010, 09:16 PM

I constantly marvel at the craftsmanship of some scale modelers. I am in complete awe with respect to the engineering, metalworking ability and attention to detail in these pieces. You have my complete admiration. Thank you for some very enjoyable videos that showcase such skill.

conehammer · 04-15-2010, 01:17 AM

Here is an update covering what I've been up to.

A video of my first scratch built gearbox test under power. This is a braked differential type, planetary differential as the core.
The power is via centrifugal clutch. The engine is an O.S. Engines FS-20;.20 cid / 3,5ccm 4 cycle.
The clutch was machined from D2 type tool steel. The gearbox housing is made from .250" 7075 aluminum
plate; the ball bearings used and gears are all stainless steel. The remainder of the bearings are oilite type.The cover is
.250" acrylic fitted with a screw cap to add oil. The gearbox presently has better than .500" oil bath; I am using
Sta-Lube air tool oil. I will reduce the oil level after tests are complete.

As you can see this was truly an example of a "Jerry rigged" test setup; I wanted to test the gearbox but did not yet
want to commit to using this starter assembly; so no permanent mount was made.

http://www.youtube.com/watch?v=5_YHZLUItVI

At the end of the video you'll hear me exclaim as I burnt the middle finger of my left hand just after disconnecting the fuel line. The
exhaust stacks on model 4 cycle engines get quite hot!

All in all a very good test, even the clutch disengages when I want it to... I will take a break for a while then move on to the installation
into a model.

Since the video was made I've finalized the starter and most of the shift interface. I will begin on getting it mounted in the target model: a 1:10 Hetzer.

For the complete development story please refer to my website, http://tanks.linite.com/ under the gearbox page. At the bottom of that page.

Jerry

01-22-2010, 09:16 PM	#1
Ron Wood Moderator 2010 LugerForum Patron Join Date: Jun 2002 Location: Santa Teresa New Mexico just outside of the West Texas town of El Paso Posts: 7,051 Thanks: 1,123 Thanked 5,287 Times in 1,728 Posts	I constantly marvel at the craftsmanship of some scale modelers. I am in complete awe with respect to the engineering, metalworking ability and attention to detail in these pieces. You have my complete admiration. Thank you for some very enjoyable videos that showcase such skill. __________________ If it's made after 1918...it's a reproduction

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

04-15-2010, 01:17 AM	#2
conehammer User Join Date: Jul 2007 Posts: 116 Thanks: 1 Thanked 55 Times in 21 Posts	Here is an update covering what I've been up to. A video of my first scratch built gearbox test under power. This is a braked differential type, planetary differential as the core. The power is via centrifugal clutch. The engine is an O.S. Engines FS-20;.20 cid / 3,5ccm 4 cycle. The clutch was machined from D2 type tool steel. The gearbox housing is made from .250" 7075 aluminum plate; the ball bearings used and gears are all stainless steel. The remainder of the bearings are oilite type.The cover is .250" acrylic fitted with a screw cap to add oil. The gearbox presently has better than .500" oil bath; I am using Sta-Lube air tool oil. I will reduce the oil level after tests are complete. As you can see this was truly an example of a "Jerry rigged" test setup; I wanted to test the gearbox but did not yet want to commit to using this starter assembly; so no permanent mount was made. http://www.youtube.com/watch?v=5_YHZLUItVI At the end of the video you'll hear me exclaim as I burnt the middle finger of my left hand just after disconnecting the fuel line. The exhaust stacks on model 4 cycle engines get quite hot! All in all a very good test, even the clutch disengages when I want it to... I will take a break for a while then move on to the installation into a model. Since the video was made I've finalized the starter and most of the shift interface. I will begin on getting it mounted in the target model: a 1:10 Hetzer. For the complete development story please refer to my website, http://tanks.linite.com/ under the gearbox page. At the bottom of that page. Jerry