Thread: How a 13c Grub Screw broke my Lathe

G'day Babylon5

Sorry to hear about your woes with the the lathe. What a PITA. But not to despair. Your Dynalink is a MC900 clone with a reeves pulley system. Spares should be readily available from Carbatec especially in Brisbane as that is their head office and warehouse.

Hare and Forbes is another place that should have them.

Bummer!!!!! Hope it all works out for you.

I realy hate muck-metal, hope you can get the new bits

Hare and forbes. Just have all the measurements you can think of. Pulley diameter, spindle diameter, pulley width at spindle, groove type. Shouldn't be a problem to replace.

Rotten luck mate but quite fixqable as others have said. A good chance to clean everything up and check for any other possible trouble spots.

Originally Posted by thefixer

G'day Babylon5

Sorry to hear about your woes with the the lathe. What a PITA. But not to despair. Your Dynalink is a MC900 clone with a reeves pulley system. Spares should be readily available from Carbatec especially in Brisbane as that is their head office and warehouse.

Big thank you to Thefixer and everyone else for all the info.

I ended up calling Carbatec today and the lady that answered the phone didn't have a clue what part I needed and said she would get someone else to phone me back. In the meantime I phoned up Hare & Forbes who were actually on their game and instantly provided the part number etc.

As per usual, the parts have to come from Sydney Hare & Forbes (Brisbane is such a small town, nobody stocks anything ) and they should be arriving tomorrow.

I'll give a to Hare & Forbes for having a diagram available of the spare parts online to view. Only downside is that the diagram is hand drawn and to read the part numbers was very difficult. But it did make it easier to explain to the guy on the phone what part I was trying to replace.

Now just one final question. Would anyone know the correct way to reassemble the pulley once the part arrives? I know the pulley on the driveshift moves up and down the shaft depending on the rpm speed. Should the pulley on the motor shaft also move along the shaft or should that be totally secured by the grub screws?

I can not help with the rebuild but did you check the lower pulley? If they were made same time, same place, it may be ready to crumble as well and while you are in the mood you could replace both. just a thought even if a bit late.

Best of luck

Originally Posted by Rum Pig

I can not help with the rebuild but did you check the lower pulley? If they were made same time, same place, it may be ready to crumble as well and while you are in the mood you could replace both. just a thought even if a bit late.

Best of luck

I checked the other pulley and it seems in good working condition and at $55 for a set, I'll wait and see how it all plays out. I'd rather not aggravate the Ministry of War & Finance on a replacement part for something that isn't broken.

G'day Babylon5

Hope these pictures help

Pics 1 and 2 show the pulleys on the motor shaft. As you can see the left part of the pulley in fixed to the shaft and the right part slides left to right against the spring.

Pics 3 and 4 show the pulleys at the headstock and the right hand part is fixed to the drive shaft with grub screws and the left part slides left to right as you rotate the variable speed lever.

And, yes everyone, I am well aware that I need a new drive belt

Also, have a look at this sites PDF. It is a "grizzley lathe" but still a mc900/mc1100 clone. At the bottom of the file is breakdown of the lathes components and a parts list.

http://grizzly.com/images/manuals/g1067z_m.pdf

G'day Babylon5

As you have discovered the hard way, the pulleys are the real weak spot with these otherwise quite robust lathes. They are quite poor quality aluminium castings, and I don't think age has much to do with their liability to fail, although it wouldn't help. The most typical damage I have seen happens when people try to lever the pulley halves apart with a screwdriver to replace a belt ...

Before you assemble the new pulley on the shaft, take the opportunity to sand and polish any tool-marks off the inner faces of the halves - try and get a nice shiny finish with metal polish. This helps greatly with minimising belt wear and helping with smooth speed changes. If you're game to disturb it, do the same with the other pulley. And remember - lots of regular lubrication on the shafts (INOX highly recommended).

PS see if there is an oiling point (looks like a ball bearing ) on the end of the motor shaft . Some have them some don't . Oil often .

Just a quick update. Finally got the part from Sydney the other day. Strange that it was sent as "Overnight" yet it took 2 days to get from Brisbane to Sydney

Nearly had to place an order for another pulley as my 3 year old son decided to sit down on the good pulley that I had taken out and left on a stool. Luckily nothing cracked and after giving the shaft and pulleys a good clean and sand, I put everything back together.

What an effort to get that circlip back on to the motor shaft with that huge spring . Ended up getting the wife to help as trying to use the circlip pliers in one hand whilst using your other hand to hold back the spring was an exercise in frustration.

So once again, I owe a thanks to everyone for their helpful hints and tips.

P.S. If there are any Woodturners on the Northside of Brisbane that would allow me to come over and watch you to gain some tips when they are next using their lathe, I would be forever grateful.


Cheers,
Shane.