- Messages
- 59
- Reaction score
- 144
- Points
- 108
- RC Driving Style
- Bashing
A while back I did the big block conversion on my revo. Stuck a Dynamite Big red in it, moved the tranny forward about 10mm and used some custom cut 2mm carbon fiber plates to lift it up, replaced the plastic drive shafts and CVDs with steel ones, did the diff upgrades and removed the electronics battery enclosure so I can use a 2s receiver battery.
Looks pretty sick with the proline ratrod body on it.
Shredded the original plastic gears but I was able to find some Robinson Racing steel FOC set. Little truck was hauling. After about 10 minutes, catastrophic failure.
Primary shaft snapage...
Bought a few and they both snapped within 15 minutes. It appears the pin hole is the failure point. After talking to a few people and one of the tooling guys at work I came up with the idea to have him use a piece of 6mm tool steel. I had him mill out a flat spot where the 2mm pin would go and use some M3 set screws. And instead of having him mill the ends down for the 5mm id bearings I had him keep the shaft at 6mm and I got some 6x11x4 bearings.
Drilled out the 2mm hole in the primary clutch and tapped for a M3. This was tedious because I had to carefully file and area that might have become raised from drilling and tapping, the bearing needs to fit snuggily on the primary clutch, but can't be too tight where you feel resistance in the bearing.
Had to punch out each 2mm hole(except the one on the slipper shaft) to 2.5m and tap for M3. This sucked. Broke a couple of taps but eventually I got everything done.
One thing I realized after I had him do it, I forgot about bearing tolerance. The shaft is 6mm exactly. But the problem is the bearing ID is 6mm. So I had to stick the tool steel into my drill press and run some sand paper up and down it until the final thickness was about 5.95mm.
And here's the finished product.
For those that have access to a machinist here's basically what I had him do
Looks pretty sick with the proline ratrod body on it.
Shredded the original plastic gears but I was able to find some Robinson Racing steel FOC set. Little truck was hauling. After about 10 minutes, catastrophic failure.
Primary shaft snapage...
Bought a few and they both snapped within 15 minutes. It appears the pin hole is the failure point. After talking to a few people and one of the tooling guys at work I came up with the idea to have him use a piece of 6mm tool steel. I had him mill out a flat spot where the 2mm pin would go and use some M3 set screws. And instead of having him mill the ends down for the 5mm id bearings I had him keep the shaft at 6mm and I got some 6x11x4 bearings.
Drilled out the 2mm hole in the primary clutch and tapped for a M3. This was tedious because I had to carefully file and area that might have become raised from drilling and tapping, the bearing needs to fit snuggily on the primary clutch, but can't be too tight where you feel resistance in the bearing.
Had to punch out each 2mm hole(except the one on the slipper shaft) to 2.5m and tap for M3. This sucked. Broke a couple of taps but eventually I got everything done.
One thing I realized after I had him do it, I forgot about bearing tolerance. The shaft is 6mm exactly. But the problem is the bearing ID is 6mm. So I had to stick the tool steel into my drill press and run some sand paper up and down it until the final thickness was about 5.95mm.
And here's the finished product.
For those that have access to a machinist here's basically what I had him do
