New layshaft

[12bolts]

I have needed a new layshaft for sometime. At some stage in its life one of the factory original plain iron bearings had been replaced with a steel bushing, but still only running on the steel shaft. They had made provision for oiling but it always ran warm to hot.
After replacing the drive motor and upping the RPM range, I thought it was time to fix the layshaft problem before something catastrophic occurred. So some 45mm dia 12L14 for bearing housings, various bits of flat bar from the scrap bin, needle rollers, oil seals and 4mm CS cap screws.

Cut the 12L14 to length, mounted up, drilled through 25/32”, then bore the recess for the needle rollers.


Cheers Phil

 

[12bolts]

Off to the DP to drill and tap for 4mm + the retainer for the bearing and the thicker end cap to carry the oil seal,

Back to the lathe and fit the end caps, turn to size, centre drill and drill through at 25/32”.


Cheers Phil

 

[12bolts]

Flip the thicker end cap over, and bore a step to accept the oil seal.
(Because my 4mm holes weren’t perfectly spaced I needed to slightly offset the bearing housing in the 4jaw to make the through hole perfectly centred)

Because one of the housings is blind capped I used a thicker piece of flat bar and bored a recess to take a thrust washer and 4 screws to deal with any extra loads.

Then flipped it the right way and turned it nice and neat.

Ball milled a pair of mounting points in each housing and drilled an oil hole.


Cheers Phil

 

[12bolts]

All the bits ready for assembly, used non hardening gasket cement to take up any small flaws in my machining.

Used a piece of 19mm 4140 for the new shaft.
Milled a keyway for the driven pulley, (there was already a keyway in the pulley but no key).

Calculated where the step pulley would locate and milled a small flat for the grub screw.


Cheers Phil

 

[12bolts]

Looks a bit better than the original.

And the damage on the old layshaft.

In place ready for action.


Cheers Phil

 

[chuckorlando]

Very nice brother. Does that bearing block fit in that housing? If so it sure looks bigger in the pics then it is. Or housing looks smaller.

 

[12bolts]

Hmmm? Sorry Chuck, not sure which bit your referring to there?

Cheers Phil

 

[chuckorlando]

In the first pic you made a bearing block. In the last pics you have the whole housing together with spindle, pulley and all. Does that bearing block fit into the cream colored housing?

 

[epanzella]

Beautiful job!