SKU: 87623892470
planetary gear in transmission

planetary gear in transmission M0.5 6x Reduction Planetary Gearset – mjbots Robotic Systems

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Description

planetary gear in transmission M0.5 6x Reduction Planetary Gearset – mjbots Robotic SystemsThis is a steel gearset for a 6x planetary gearbox, like used in the qdd100 and other Mini Cheetah style servos. It fits inside the stator of 8108 and larger sized motors. A center distance of 30. 0mm is appropriate. It includes 1 ring gear, 1 sun gear, and 3 planet gears with installed needle bearings. Ring gear specifications: 100 tooth OD: 55mm + 0 0. 05 Width: 5mm Mass: 15. 2g 42CrMo Steel HRC 25 Notional STEP File Sun gear specifications: 20

This is a steel gearset for a 6x planetary gearbox, like used in the qdd100 and other Mini-Cheetah style servos.  It fits inside the stator of 8108 and larger sized motors.  A center distance of 30.0mm is appropriate.

It includes 1 ring gear, 1 sun gear, and 3 planet gears with installed needle bearings.

Ring gear specifications:

  • 100 tooth
  • OD: 55mm +-0/-0.05
  • Width: 5mm
  • Mass: 15.2g
  • 42CrMo Steel
  • HRC 25
  • Notional STEP File

Sun gear specifications:

  • 20 tooth
  • Tooth length: 6mm
  • Overall length: 18mm
  • Hub diameter: 11mm +0/-0.02
  • Bore diameter: 4mm +0.02/-0.0
  • Mass: 10.2g
  • C-40Cr Steel
  • HRC 25
  • Notional STEP File

Planet gear specifications:

  • 40 tooth
  • Tooth length: 5mm
  • Overall length: 6mm
  • Hub diameter: 14mm
  • Bore diameter: 10mm +0.02/-0.0
  • Installed HK0608 needle bearing
  • Mass: 10.9g (with bearing)
  • C-40Cr Steel
  • HRC 25
  • Notional STEP File

Notes:

  • Mounting of the sun and ring gear can be accomplished either with a shrink fit, or with adhesive. 
  • For mounting to aluminum, we recommend:
    • slip fit 
    • degreasing mating surfaces with acetone
    • optional abrasion
    • a primer of Loctite SF7471
    • Loctite 638
    • 24 hour cure at 55C.
  • Lubrication is required for operation under load.  We recommend Sta-LUBE CRC SL3330 Moly-Graph Lithium Grease
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 87623892470

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4.1 ★★★★★
Based on 24 reviews
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Verified Purchase
Jonathan
Lowell, US
★★★★★ 5
Go Get It!
GoSports does it again. Our family has a lot of GoSports products. It brings us comfort knowing when we order a product from them the quality is going to be great. The Ball Launcher is excellent. Our lab loves the soft tennis balls that come with it, preferring them over the harder rubber ones from other brands. The launcher itself is thoughtfully designed, well-made, and comfortable to hold. Our new go-to for daily fetch sessions.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 15, 2025
S
Verified Purchase
Stephanie S.
Waukegan, US
★★★★★ 2
Gave it a Try
I have always used the Chuck It ball and ball launcher. I thought I would try this since the price was better. There is definitely a reason it is priced lower. The handle on this one twists on and constantly comes undone when you throw, and it does not launch nearly as well. I would not order this product again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
E
Verified Purchase
Elijah
Lowell, US
★★★★★ 4
A few usability issues
My dog is obsessed with playing fetch. It’s part of our daily routine. Pros - I like that this comes with two launchers so we can keep one at home and one in the car. - Build feels solid Cons - The cup is slightly too small for regular sized tennis balls. I buy the large Costco box of Penn tennis balls every couple of years for my dog. If you fully seat the ball in the cup/launching end, it’s extremely difficult to throw and puts some strain on your wrist. — the workaround is to only partially insert the ball when picking it up. - Like others have stated, the launcher does come unscrewed occasionally after a few throws. It’s kind of annoying so I’ll likely try some thread lock, but ideally that wouldn’t be necessary.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
P
Verified Purchase
Peter J Anderson
Lowell, US
★★★★★ 5
Fun!!!
I can’t say enough good things about this tennis ball launcher! Roxy absolutely loves it. Every time I pick it up, her tail goes crazy with excitement. It’s so easy on my arm, and I love that it gives her a great way to burn off energy. The launcher is sturdy, well-made, and works like a charm. If you have a high-energy pup like Roxy, this is a must-have!
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Reviewed in the United States on May 21, 2026
D
Verified Purchase
D. Rodriguez
Carnegie, US
★★★★★ 3
Fun along with frustration….
The product is good. The only problem is that the dark blue handle screws onto the lighter blue stick, and every 5-10 throws it comes unscrewed, and you have to screw them back tight. Maybe if they put a little bump in the handle and an indent on the handle so they could click into place it would work fine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026

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