Scratch building a planetary gear box

This board contains easy-to-do fixes on your new tanks from stock. This will hopefully help beginners to get the accuracy they want from their models.

Postby walter » Sun Apr 05, 2020 1:25 am

Having build and modified a number of tank gear boxes, looking for the ideal gear box and have come to the conclusion they more or less do all work. It is just a personal preference.
One though eluded me,the planetary gear box. Every time I went into its technicalities it always turned out to be in the to hard basket. Mainly obtaining the right sized ring gears. I never could find them small enough for what I wanted.
Till one sleepless night I all worked it out how to make my own ring gear using my little bench milling machine. To my amazement it was quite simple.
For the gear boxes in my tiger2 I used geared motors 50:1 and later 60:1 . They both worked well the 50:1 being a touch fast.
When I had the geared motors apart,looking at those tiny gears and visualizing that the whole workload is carried just by one tooth, made me feel a bit uneasy. Where else on a planetary gear box the load is carried by 3 teeth. Quite more appealing.
All my different geared motors are interchangeable with my gear box housing. So my planetary gear box had to be interchangeable as well.
Working out all the measurements was at times hit and miss, some parts hat to be made 3 times till they where right.
But in the end when I assembled them and they where working very well it was all worth it.
The performance of the gear box is quite astonishing.It starts working at 1.5 volt and it's strength is unsurpassed.
I planed to have 3 gear cages one 1:5 and two 1:4 in it,but found for the motors I was using the tank was running to slow.So I used only two gear cages to get the speed I wanted.
The process to change the reduction of the gear box is so convenient just add or remove a gear cage. It allows me to use a greater variety of motors.
Of all the gear boxes I own the planetary one is my favored I almost could say my ideal gear box.
Walter

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:28 am

This is how I made my ring gears
Attachments
IMG_20190928_094632 (2) (Small).jpg
IMG_20190928_094632 (2) (Small).jpg (87.82 KiB) Viewed 1141 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:29 am

Parted into individual housing sections.
Attachments
IMG_20190928_094804 (2) (Small).jpg

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:34 am

Motor end housing.
Attachments
IMG_20190928_095123 (2) (Small).jpg
IMG_20190928_095123 (2) (Small).jpg (71.55 KiB) Viewed 1136 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:35 am

Drive end housing.
Attachments
IMG_20190928_095123 (2) (Small).jpg
IMG_20190928_095123 (2) (Small).jpg (71.55 KiB) Viewed 1135 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:37 am

Motor end with motor.
Attachments
IMG_20190928_094938 (2) (Small).jpg
IMG_20190928_094938 (2) (Small).jpg (80.79 KiB) Viewed 1134 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:38 am

All the parts for the gear cages.
Attachments
IMG_20191027_121358 (2) (Small).jpg
IMG_20191027_121358 (2) (Small).jpg (81 KiB) Viewed 1133 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:40 am

Drill jig for gear cage housing.
Attachments
IMG_20191027_120206 (2) (Small).jpg
IMG_20191027_120206 (2) (Small).jpg (68.59 KiB) Viewed 1132 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:41 am

Another view.
Attachments
IMG_20191027_120312 (2) (Small).jpg
IMG_20191027_120312 (2) (Small).jpg (57.79 KiB) Viewed 1131 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:44 am

Gear cage sides drilled.
Attachments
IMG_20191027_153810 (2) (Small).jpg
IMG_20191027_153810 (2) (Small).jpg (76.53 KiB) Viewed 1130 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:45 am

Making small gears.
Attachments
IMG_20191011_123754 (2) (Small).jpg

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:49 am

Gear cage sides drilled and axles fitted.
Attachments
IMG_20191016_110122 (2) (Small).jpg
IMG_20191016_110122 (2) (Small).jpg (59.23 KiB) Viewed 1137 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:50 am

Gears added.
Attachments
IMG_20191016_110221 (2) (Small).jpg
IMG_20191016_110221 (2) (Small).jpg (58.78 KiB) Viewed 1136 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:52 am

All the parts.
Attachments
IMG_20191019_094941 (2) (Small).jpg
IMG_20191019_094941 (2) (Small).jpg (77.51 KiB) Viewed 1134 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:53 am

Another view.
Attachments
IMG_20191019_095040 (2) (Small).jpg
IMG_20191019_095040 (2) (Small).jpg (73.52 KiB) Viewed 1133 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:57 am

Cage complete.
Attachments
IMG_20191016_110309 (2) (Small).jpg
IMG_20191016_110309 (2) (Small).jpg (52.66 KiB) Viewed 1132 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 1:58 am

The other side.
Attachments
IMG_20191016_110427 (2) (Small).jpg
IMG_20191016_110427 (2) (Small).jpg (57.17 KiB) Viewed 1131 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 2:01 am

Another view.
Attachments
IMG_20191104_111932 (2) (Small).jpg
IMG_20191104_111932 (2) (Small).jpg (77.98 KiB) Viewed 1129 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 2:06 am

Right 5:1 left 4:1
Attachments
IMG_20191017_141159 (2) (Small).jpg
IMG_20191017_141159 (2) (Small).jpg (85.9 KiB) Viewed 1127 times

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Postby walter » Sun Apr 05, 2020 2:07 am

Both cages.
Attachments
IMG_20191104_111846 (2) (Small).jpg

walter
Sergeant
 
Posts: 529
Joined: Fri Mar 10, 2017 12:53 pm
Location: Geelong Australia

Next

Return to Things to fix on your new tank

Who is online

Users browsing this forum: No registered users and 1 guest