1/10 Liebherr Excavator R 984 Litronic

[JAMMER]

OK I sure will be looking forward to that. Ed

[Markus K.]

Hi folks,

here now the (original built) turntable. It has an internal gear with 107 teeth, modul 2. This gear are two parts, every one got a radius on the edge for the 5,5mm steel balls. The gear is bolted to the gear carrier with 48 screws.
Then there are two outer rings with a radius for the balls, also. They are filled with 135 balls and then evenly closed with 3 screws. The upper body of the excavator will be bolted with 45 screws to the turntable.
The internal gear was done by my buddy Michael on his cnc-mill with a 0.4mm endmill. The screws were made by myself, 96 pcs for this turntable and 288 for the Michaels turntable for the R9100.

As I mounted the stuff together I found out, that the turntable need much power for turning, so I had to improve. With a sharpie I colored the ball groove and used a 5.5mm Drill shaping the groove with the drill flange, about 3 or 4 times. Now it runs smooth and without any play.

[Markus K.]

here are some selfmade screw-pics:

[JAMMER]

Nice work on the screws but cutting the internal gear on a cnc mill that took some planning and skill with the CAD. Ed

[Markus K.]

Ed, the CAD-work wasn't sooo hard. I used CATIA V with a plugin for gears. So I had only had to type in some numbers and voila... a single file came out with over 30 MB

[ihbuilder]

welcome Markus great job on the model so far Your slew assembly is exactly the way I am making them on my cat385s . I have my internal drawn and programed for the cnc mill comes to about 2 hrs cutting time .Just to find time to cut them . How long did it take to cut yours out ?

[JAMMER]

Hi Markus are you sure you used a 0.4 end mill to cut your ring gear that is like a hair diameter? If I am not mistaken that is steel you cut how many end mill did you break? 0.4 is .0155 inches are you sure you got that figure right? If it is right that was some fine work a great job. Ed

[ihbuilder]

Originally Posted by JAMMER

Hi Markus are you sure you used a 0.4 end mill to cut your ring gear that is like a hair diameter? If I am not mistaken that is steel you cut how many end mill did you break? 0.4 is .0155 inches are you sure you got that figure right? If it is right that was some fine work a great job. Ed

Ed , quite plausible with right feeds and speeds to depth of cut hence the long run times . Also , rigidity of machine is a big + , the lil grizzly's will not handle that size without breaking them . I have run .01" already . another thing , tool run out will kill em in these sizes .