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03-17-2005, 11:04 PM | #1 |
Quarry Creeper Join Date: Jan 2005 Location: Denver, CO
Posts: 388
| anyone tried worm gears?
i always used to fool around with Lego's and make trucks and whatnot. the most useful lego reduction was the worm gear. i was just wondering if anyone has ever tried to use one. if i were to build an axle, there would be a worm gear in place of the differential, much better reduction, and easier than bevel gears. |
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03-17-2005, 11:08 PM | #2 |
06 Super National Champ Join Date: Jun 2004 Location: Stark Industries Bar and Grill
Posts: 11,361
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03-18-2005, 12:28 AM | #3 |
PapaGriz Yo Join Date: Apr 2004 Location: In the garage building the wife a crawler
Posts: 13,137
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Ace did this a long time ago, he will be at the next get together. He machined his own axles with a 20:1 gear reduction. It werks awesome but has short run times. He thinks it is due to the low efficiency of the worm gears. What are you pimping? |
03-18-2005, 12:29 AM | #4 |
Quarry Creeper Join Date: Jan 2005 Location: Denver, CO
Posts: 388
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nice, thanks
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03-18-2005, 08:19 AM | #5 |
Rock Crawler Join Date: Apr 2004 Location: Longmont, CO
Posts: 901
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Worms are really attractive because they self lock and have really high reduction in a single stage. Problem I found is efficency. The chart sez about 70% at 20:1 and even that I think is low. Those ratings are for worms running at higher rpm with lower loads. A crawler puts relatively high loads are low rpms and the friction losses are high. My worm crawler runs about 5-7 minutes under hard climbing conditions. I remember having to change batteries 3 times on the 1st section at the UTRCRC comp! That truck is the most manoverable rig I have, and it's only 2WS. Partly because the worms lock the axles, kiney like having brakes on the steep stuff. I can back up 1/2" stop move forward 1/2" when doing a 20 point turn... Even on a real steep slope it won't roll. Worms at 4:1 are more efficent but they don't lock. Next axles I build will have bevel gears with compound spur/pinion to get about 20:1 ratio in the axles again. |
03-18-2005, 10:37 AM | #6 |
Quarry Creeper Join Date: Jan 2005 Location: Denver, CO
Posts: 388
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thats cool, but those runtimes are horrible.
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