- Joined
- Mar 24, 2020
- Messages
- 9
Hi. I have recently got a Harrison L5a. Apart from being very dirty it all appeared to be good with very little wear anywhere. Unfortunately on stripping down the Norton gearbox I now realise why it has seen little use. The centre splined shaft which holds a cluster of ten gears has stripped splines at one end, and matching damage to the gears. The shaft is also badly bent. My best guess is that this was caused by someone engaging the box with the machine running. In any case this damage means that neither the screwcutting or power feeds can be used, so the machine is very much manual only. The only good news is that apart from the shaft bushes nothing else is damaged. I have tried all sorts to try and source parts, or even a replacement gearbox but without success.
I am very much hoping someone will be prepared to help me out by making replacements for the shaft and three damaged gears which are 32, 30 and 28t.
Hopefully I will have attached some pictures of the damaged shaft, and of one of the intact gears.
The shaft is 7.730in overall. The smaller diameter end is 0.481 in diameter, the larger end 0.619. The splined portion is 4.604 in length and the outside diameter of the seven splines is 0.618, with a root diameter of 0.545. As best as I can measure them The top of each spline is 0.112 wide and The roots are 0.105.
The outside/root diameter of the gears are 32t 2.120/2.019, 30t 1.996/1.696 and 28t 1.869/1.540. Each gear is 0.633 thick.
The hole through the shaft is for a taper pin which holds a collar on the shaft to align the gears with others in the box. Endfloat is controlled by the fact that the bush at the larger end of the shaft projects from the casting and bears on the face of the 32t gear. I would obviously be able to forward the old shaft and associated collar and pin, together with an undamaged gear for patterns.
Any help would be much appreciated.
I am very much hoping someone will be prepared to help me out by making replacements for the shaft and three damaged gears which are 32, 30 and 28t.
Hopefully I will have attached some pictures of the damaged shaft, and of one of the intact gears.
The shaft is 7.730in overall. The smaller diameter end is 0.481 in diameter, the larger end 0.619. The splined portion is 4.604 in length and the outside diameter of the seven splines is 0.618, with a root diameter of 0.545. As best as I can measure them The top of each spline is 0.112 wide and The roots are 0.105.
The outside/root diameter of the gears are 32t 2.120/2.019, 30t 1.996/1.696 and 28t 1.869/1.540. Each gear is 0.633 thick.
The hole through the shaft is for a taper pin which holds a collar on the shaft to align the gears with others in the box. Endfloat is controlled by the fact that the bush at the larger end of the shaft projects from the casting and bears on the face of the 32t gear. I would obviously be able to forward the old shaft and associated collar and pin, together with an undamaged gear for patterns.
Any help would be much appreciated.