Mellor lathe.

[Pete.]

So did I that's why I gave it as an example. 16DP is quite common for change gears.

 

[MattF]

With the Drummond's they're 14DP, hence why the standards are no use to me. Haven't checked the DP of the others, but I know they aren't Drummond spec.

 

[eLuSiVeMiTe]

Just wondered, as I have some standard pattern gears here, (came mixed in with the Drummonds), which are no use to me for the Drummonds. I'll not be using them as I don't want to risk any mix-ups. I've already got a couple of Drummond gears with missing teeth due to some previous owner dropping that faux-pas. If you let me know the tooth counts, I'll see if I have owt which may help. You may have to rebore or sleeve, and sort a keyway though.

You need to check the DP of your gears to see if they match. Checking is easy. Take the tooth count, add two and divide by the diameter in inches. So if your 80 tooth gear is 5.125" diameter it's 82/5.125 = 16, it would be a 16DP gear.

Of course to check if your gears are the same DP all you need actually do is compare the diameters of the same tooth count gears, but knowing the DP helps. After that all they need to be is the same pressure angle, which being that old they probably are both 14.5degrees.

Out of interest how would you confirm pressure angle.

I'm also 16dp and gonna have to hunt down gears to bore/bush. Missed a near complete set last week even with a £200 bid.

On the plus side. I have the 127.

 

[Pete.]

Pressure angle isn't easy to tell visually, especially if they are old and worn. I don't know of a reliable way but there are a few good programs that you can draw and print a gear on paper. If you printed both and sat the gear over the printed image the profile would be fatter at the base for the 20pa. 20pa is stronger, 14.5pa is quieter. Personally for change-gears on old lathes I'd just mix and match and make sure you have plenty of clearance and lube.

 

[MattF]

Can't recall on mine whether the non Drummond gears are a different DP, PA or both, (I think I have a mix of both), but I know they mesh like dogs. I freehand mesh them to check, whenever I think one looks suspect. You can generally tell by eye that something's not right.

 

[eLuSiVeMiTe]

Annoyingly I have a load of pitch gauges kicking around. Where I don't know. I'll go down the draw and print method.

Or not. 16DP, 20PA, 1/2" face, 3/4" bore 1/8" key.

Quick search on the s&b yahoo group bore fruit

 

[eLuSiVeMiTe]

Can't recall on mine whether the non Drummond gears are a different DP, PA or both, (I think I have a mix of both), but I know they mesh like dogs. I freehand mesh them to check, whenever I think one looks suspect. You can generally tell by eye that something's not right.

Well if you have anything close to the above I'd be happy to take them off you. Got a couple of donors for boring here already.

 

[MattF]

I'll see what's left if/after owt's gone to Spencer.

 

[God mode restorations]

Finally got the Mellor in place. What a faffing nightmare that was.taking apart easy..putting back to gether on ya own is a task.

 

[Richard.]

I really really like that spencer. That’s a stunning little thing.
Looks really well built for its size. What is it regarding size wise? Is it bigger than the ml1

 

[God mode restorations]

I really really like that spencer. That’s a stunning little thing.
Looks really well built for its size. What is it regarding size wise? Is it bigger than the ml1

Yes. It's slightly bigger than the ml7. And heavier built. Huge weight for a machine of its size. Will strip down and clean and oil and adjustment.

 

[Richard.]

Nice. Yes it looks a solid little lump. An absolute bargain for what you paid.
Are you going to be moving any of these on once done are are you keeping them all.
4 of them now isn’t it?

 

[God mode restorations]

Nice. Yes it looks a solid little lump. An absolute bargain for what you paid.
Are you going to be moving any of these on once done are are you keeping them all.
4 of them now isn’t it?

I will be keeping them. Once the Mellor is sorted I can have a rerange and sort out.

 

[God mode restorations]

Nice. Yes it looks a solid little lump. An absolute bargain for what you paid.
Are you going to be moving any of these on once done are are you keeping them all.
4 of them now isn’t it?

Yes 4. Have still got to pick the other one up.

 

[God mode restorations]

Been busy today. Started cleaning the Mellor. Starting with the tailstock. A complete strip down and clean. Once I started I realised I had offset tailstock facilities . An added bonus that was.

 

[Richard.]

Been busy today. Started cleaning the Mellor. Starting with the tailstock. A complete strip down and clean. Once I started I realised I had offset tailstock facilities . An added bonus that was.View attachment 123826 View attachment 123827

Oh god!!!!. Didn’t you learn the last time you pulled one apart

 

[addjunkie]

Oh god!!!!. Didn’t you learn the last time you pulled one apart

Apart from the belts it doesnt look broke!

 

[God mode restorations]

Oh god!!!!. Didn’t you learn the last time you pulled one apart

Yes. But everything is in good order on this one. Just needed a good clean and oil

 

[God mode restorations]

Apart from the belts it doesnt look broke!

It's note broke. But does need a good clean and oil.

 

[penfold]

A slip of paper between gears gives suitable clearance when setting them.

What he said. Bedway oil is equally good for lubricating the gears as it sticks on like dogtoffee to a blanket.