myford super 7 tufnol gears

[Tinbasherdan]

Super 7 as far as I know

 

[MattF]

Easier to just say RDG own the Myford name now, RP. Dan, this is a, (apologies it's not the best quality), photo of a tumbler assembly from a different machine. It should give you an idea of the spacings you should be seeing between the gears and their teeth though. You'll note from that photo that non of the gears are up tight to each other.

 

[Tinbasherdan]

Ah don't suppose anyone has a pair of tumblers for mine hanging around

 

[MattF]

I can't speak for the previous gears! The guy might have crashed it and stripped them, that's how it came to me

Thinking about it, that may be why the previous gears were stripped. I'd been thinking they were already replacements with them being composite material, but if that's how Myford supplied them originally, it could well be a cockup on RDG's part if that's the case. However, were the previous gears tight to turn, or did those turn freely enough, (we're obviously skipping the stripped teeth point in this question )?

 

[ukracer]

I would ask for a myford user to measure their gears for you. That a good start.

 

[Tinbasherdan]

They turned freely enough. Genuine original myford are tufnol to act as sacrificial parts of the transmission from what I can work out

 

[ukracer]

Thinking about it, that may be why the previous gears were stripped. I'd been thinking they were already replacements with them being composite material, but if that's how Myford supplied them originally, it could well be a cockup on RDG's part if that's the case. However, were the previous gears tight to turn, or did those turn freely enough, (we're obviously skipping the stripped teeth point in this question )?

My Raglan 5 inch has composite gears on the tunbler so I am guessing they are sacrificial and save a lot more damage.

 

[DanielW]

Super 7 as far as I know

Measure the spindle bore and see,you never know the spindle might have been changed?

 

[ukracer]

They turned freely enough. Genuine original myford are tufnol to act as sacrificial parts of the transmission from what I can work out

Turned when??

 

[MattF]

Turned when??

He means the original pair that were stripped turned freely enough. We're all as bad as each other for losing the plot here. Definitely beginning to sound like the replacement gears may be at fault, though how they can cock something that simple up is beyond me.

 

[Tinbasherdan]

When the old gears were on when I got it, for the 1/4 of a turn that they meshed

 

[MattF]

My Raglan 5 inch has composite gears on the tunbler so I am guessing they are sacrificial and save a lot more damage.

Makes sense. A lot easier and cheaper than replacing cast ones, and with less chance of damage to other parts.

 

[ukracer]

He means the original pair that were stripped turned freely enough. We're all as bad as each other for losing the plot here. Definitely beginning to sound like the replacement gears may be at fault, though how they can cock something that simple up is beyond me.

I would expect them to turn freely if stripped. Even they cant get the bore wrong lol If they have not been cut deep enough then thats where I expect the meshing to suffer.

 

[MattF]

I would expect them to turn freely if stripped. Even they cant get the bore wrong lol If they have not been cut deep enough then thats where I expect the meshing to suffer.

Aye. It's me who's confused this thread slightly. Apologies. His original pair of gears, where the teeth were still intact, meshed nicely and turned readily. The new pair didn't, at any point in time. They were tight from the get go. Definitely sounds like a call to RDG is in order, as in that photo of the now stripped replacements, they appear to be meshed way too tightly. Looks like they've cut their blanks slightly oversize.

 

[ukracer]

Agreed.... (about the oversize blanks). lol

 

[CRB]

I have had a number of things thus week from Myford incorrectly manufactured. T slot bolts that did not fit the slots, cross slide screw and nut that were tight etc. For starters.

So it would not surprise me if they were out of tolerance.

I bought 6no of three sizes and measured each one for a table for them, to show how bad they were. It was not easier than making them myself. One of the six fitted without modification.

I have an ML7 so probably different, but my tumblers are two sizes, 24 and 27.5 diameter. I am not counting teeth and measuring more accurately at this time of the morning.

 

[Pete.]

First things first, count the teeth on your gears, make sure you have the proper tooth counts. Next fit each gear in turn, see if they turn freely on the stub. If they do turn individually but not when meshed you have either the wrong tooth form or one/both is made wrong.

 

[Tinbasherdan]

Looks like it is the gears to blame :/

 

[DanielW]

Looks like it is the gears to blame :/

Well explain how you came to that decision?

 

[nick952]

Have you checked the rest of the gear train, because obviously something caused the origional gears to strip.

I'd take the driven gear off the leadscrew and then try turning the handwheel, in fact take the whole gear train appart and check that all the gears rotate freely on their respective studs as you re-asemble (the whole gear train should rotate smooothly, but sound a bit "rattily" when the mesh is correct).