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Picked up another Diamond today

Billygoat

Cast Iron
Joined
Dec 15, 2007
Location
Carnegie, PA
Picked up another Diamond M22 today. On Craigslist for $250. Is in pieces. I have 2 other Diamonds so I can see how it goes back together. Guy said it has been this way in his shed for 20 yrs. He said all the parts were there. He tore it apart and left it set. Was covered with junk when I first saw it. Got it for $225. He called it a Trantor, not a Diamond. Trantor was a machinery supplier in the Pittsburgh Area. He didn't even know what he had. He also had a Tree vertical head for sale but another guy contacted him first so he was giving him first crack at it. He was going to put the Tree head on the Diamond but never did. I think I can get it back together with out much of a problem. I just restored another Diamond last year.

 

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Weather warmed up so I have been able to start work on the diamond. Narrowed the base chip pan from 40" to 24" like I did on the last one I restored. The wide pan is to catch the coolant but the cooling system is long gone on this machine. Ordered and got new spindle seals and belts.
 

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A couple more parts cleaned, painted and installed. The other hand wheel was broken but found one that should work fine on Ebay. Here tomorrow.
 

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Few more components installed. New handwheel looks like it belongs. Drum switch came today. Picked up 28 horizontal cutters today from Ebay for $50. All but 5 are 1" bore.
 

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If you keep this up you'll be able to start a production row there! You'll be sing'n 99 bottles but about "make a slot, pass it on down, 98 parts in the box."

Looking good!
 
The hard part is yet to come that will test my skills. The brass gear for the power feed is bad. I think this gear was the Achilles Heel of these mills. When I bought the first Diamond in 2008, the guy said he had to have a gear made for the power feed (I bought it from someone here on the forum. Can't remember his name but he lived near Cranberry, PA.) That is why the end of the table was torn apart. The guy I bought it from didn't know what to do with it and let it sit for the past 20 years.

The gear is 16 DP with 20 teeth. I have a dividing head and a cutter and I think I can make it. I really don't have much choice. It isn't like there is a bin of these gears some where and I can buy one.
 

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That gear being brass guarantee's that they intended it to be an expendable. It just sucks that there isn't an OEM to expend them to us anymore. If they had made both it and the mating gear out of a harder steel, they might last a little longer but eventually they would both wear out and be more expensive to replace. If you're going to tool up to make it yourself, make extras if you can. The skill and expense in making them is in the initial tool-up, while the material and run time per piece is cheap. The other possibility would be to turn the blanks and have a gear shop cut the teeth, but custom gear shops aren't getting any cheaper either.

I'd spend some time with Machinery's Handbook figuring out the angles and calculations. Given it's brass and not too big, you can probably tool up your Diamond mill that's in the best shape to make replacement gears for it's siblings. Won't be quick, but it'll be a lot cheaper than subbing it out.
 
Nice to see your mill getting fixed up.
Maybe this isn't a worth while option for you but in a similar situation I might consider getting a gear from Boston gear and either making a new hub or turning the teeth off your existing hub and using a press fit with radial dowels or some silver solder to attach a bored out Boston Gear to the hub .
If the stock gear was too thin you might be able to pair two together or face it back when too thick.
I didn't check the cost on this one but they didn't used to be all that expensive.
I did look in my collection of assorted gears from an auction sale to see what I might have but no luck on the right number of teeth so far.
I have a couple of other places to look and I'll let you know if something turns up.
I also looked for Brass Pinion wire but didn't turn up anything in 16D.P. x 20 T so far.
Jim
 

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I have all this equipment, machines, gear cutters, micrometers, brass stock, so I have to try to make one. I found a worm and gear on Ebay that is 16DP, 20 teeth. The gear is only 5/16" wide and I would have to attach it somehow to the rest of the part to make it work. Can't use a spur gear because they have straight teeth. The worm gear teeth are angled. The Ebay gear has all the dimensions I need. I could buy this one but what is the fun in that. Plus it needs to be modified anyway so I just as well make the entire part. Buying it will be the last resort. At least I have this option if I can't make it but I don't intend to fail.

I found another chart that shows the angle of almost 6 degrees. I still have to consult my Machinery Handbook.
 

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The wheel should be bronze,not brass ,and likely is............bronze wheel and hard steel worm is the time proven pairing for a worm drive............and the wheel is certainly not intended to strip in service.
 
Got the drive and the motor installed. Runs. Might tackle the feed gear next.
3/4 HP single phase motor. New drum switch I found on Ebay.
 

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Practicing on the gear. Made a couple dummy pieces. Tried an involute gear cutter but really didn't like how it looked. Then I got the idea to take a 3/4" diameter woodruff key cutter which is the same diameter of the worm and grind it to the shape of the gear tooth. Works really well. Now I only need to get the proper angle of the teeth. Almost ready to cut the real part.
 

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Got the drive and the motor installed. Runs. Might tackle the feed gear next.
3/4 HP single phase motor. New drum switch I found on Ebay.
Is that an open frame motor? If so, might want to consider a sheild of some description as motors LOVE to ingest metal.
 
Made the gear part today. Looks very good. Install tomorrow. I think I am going to make another for a spare.
 

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Perfect fit. The key is missing so I have to make that. It stays with the worm gear part while the screw turns and moves the table. It has like a gib head on both ends so it doesn't fall out while the screw turns. Bought a piece of 1/8" x 1/4" key stock to make it from.
 

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