What is undercutting a transmission?
Undercutting a transmission involves machining angles on the engagement dogs and slots to prevent the transmission from jumping out of gear under load.
What is back cut transmission gears?
“Undercutting”, or “back-cutting” is a process where these square shaped drive dogs and slots are cut at a small angle, so that when they are meshed together, the power applied to them actually forces them together and it’s impossible for them to slip free while under load.
What are the two types of motorcycle transmission?
Types include: hydraulic automatic transmission, continuously variable transmission, and dual-clutch automatic transmissions.
What is interference and undercutting in gears?
Interference，the non-conjugate contact between the-teeth of meshing gears, takes place between the tooth tips of one gear and the tooth fillets of the other． This action is the result of involute interference between the tip of the rack cutter tooth and the flank of gear tooth and is known as undercutting．
How do you prevent gear interference?
5 measures to reduce gear interference
- Use of a larger pressure angle can eliminate interference.
- Interference can be eliminated by under-cutting of tooth.
- Elimination of interference is possible by tooth stubbing.
- Increasing the number of teeth on the gear can also eliminate the chances of interference.
How do I know if my motorcycle transmission is bad?
10 Symptoms of a Bad Transmission
- Lack of Response. Hesitation, or outright refusal, to shift into the proper gear is a telltale sign of transmission trouble.
- Odd Sounds.
- Leaking Fluid.
- Grinding, Jerking, or Shaking.
- Burning Smell.
- Won’t Go into Gear.
- Service Engine Soon.
- Noisy Transmission in Neutral.
How much does it cost to fix a motorcycle transmission?
Figure $400-$500 for a complete tranny rebuild and undercut and $500-$750 in labor and misc. This is why alot of guys just do a motor swap, its easier, cheaper, and you can be done in less that one day/eveing. If you can do it your self you can cut the cost down considerably.
Why is undercutting done in gears?
The main reason for undercutting to occur is, when cutting a gear with a small number of teeth (for standard gear with 20° pressure angle, number of teeth z = 17 or less), the tip of the cutting tool goes beyond the interference point. In this case, the root of the gear tooth becomes thicker.
How do I stop my gears from Undercuting?
To prevent undercut, a positive correction must be introduced. A positive correction, as in Figure 4-6, can prevent undercut. Undercutting will get worse if a negative correction is applied.
What does it mean to undercut a transmission?
Undercutting a transmission involves machining angles on the engagement dogs and slots to prevent the transmission from jumping out of gear under load. There are three types of undercuts available from APE Racecut… This cut is performed on the side of the dogs that are loaded on acceleration.
Do you have to undercut gears on sportbikes?
Some of the newer sportbikes are coming from the factory with undercut gears in the transmission. When you send us your trans, if it has factory undercut that is adequate, you will not be charged for undercutting that gear or gears.
What causes a transmission to jump out of gear?
The transmission gears lock together with a series of “dogs’ or “dogs and slots” The photo below shows several of the dogs engaged together so that both gears turn together. Under hard use, the gears can began to separate until the dogs become disengaged, this causes the transmission to jump out of gear.