Edison class m restoration

[daverob]

Really? Should I maybe add some beeswax ?

Here's an action shot with my jury rigged belt (thanks youtube). Kind of amazing this electric machine is from 100 years before George Harrison released "I've got my mind set on you".. Which, incidentally, is not unlike playing a single short cylinder record on a machine equipped with a repeater...

[MicaMonster]

If it doesn't have beeswax, I'd leave it alone! Congrats on getting it running!!!!!

[n2wheelies]

just gorgeous.

[daverob]

Any helpful hints on getting the belt that drives the mandrel to keep from slipping off the pulley there? It doesn't quite line up perfectly...

[Andersun]

Any helpful hints on getting the belt that drives the mandrel to keep from slipping off the pulley there? It doesn't quite line up perfectly...

Daverob,
I already mentioned the below comment on the mandrel you have:

"Some notes concerning your Class M:
1. I dont believe your 2/4 mandrel will or ever has worked on your Class M. It is too long when you take into account the required placement of the belt pulley with respect to the belt configuration and the end gate on the Class M which has a casted flange which covers the right mandrel bearing."

You need to get a Triumph 2 minute or a Class M mandrel for it.

There is a Class M mandrel on Ebay right now......

http://www.ebay.com/itm/EDISON-PHONOGRA ... 2c95b66ed5

[daverob]

I guess I'll shelve it and wait for an entire triumph or spring motor model to appear for slightly more than a 1500 dollar mandrel.

[phonogfp]

It should be mentioned that your Class M originally had a brass, lipped mandrel like the one currently on eBay. You can use a common mandrel from a Triumph, but the brass one is historically correct.

George P.

[Andersun]

I guess I'll shelve it and wait for an entire triumph or spring motor model to appear for slightly more than a 1500 dollar mandrel.

Take your time, you will find what you need

[De Soto Frank]

I realize that "correct parts" are usually the best way to go, but I'm going to go ahead and ask a naïve, neophyte question anyway.

Let's agree that a correct mandrel from a Class M or 2-minute Triumph would be the best fit for this machine...


But, until one presents itself at an agreeable price....


From the various comments regarding the 2&4 mandrel that came with this machine, and photos, and the comments about the mandrel-belt continually being "thrown", it seems to me that the mandrel pulley is too close to the motor-end of the machine.

Is it possible for a good machinist to do some work to the mandrel, and move that pulley towards the end-gate far enough for the belt to be in decent running alignment ?


Sorry if this pushes into "heresy"...

[Andersun]

Sorry if this pushes into "heresy"...

I believe you will have troubles with any mandrel option other than an original Class M mandrel ( as George Paul described ...... brass, lipped mandrel like the one currently on eBay) unless you swap the Class M endgate with a Triumph Model A endgate.

You will also have to swap the feed screw end bearing/gear with a regular pointed type end bearing. With this set up, you can adjust the mandrel to get the exact positioning of where it has to be to align with the belt.

From there, you could use even a Home Model A mandrel but you will have to slow down the motor to make up the difference in pulley sizes between the Triumph and Home. (that is if the thread pitch is the same between the two)

This is based on my observations of sight comparing a Home Model A and a Class M mandrel. I have never physically tried this.

The same seller as the Class M mandrel also has a Home model A mandrel:

http://www.ebay.com/itm/EDISON-HOME-PHO ... 2ee3ed5e1f