- Thread starter Bki26
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dieselsamurai
Too many projects not enough time!
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Well done ! Great lathe should be very handy
dieselsamurai
Too many projects not enough time!
- Messages
- 1,596
- Location
- Hampshire
The 5" is much better especially the apron as the mk2 i had could be a bugger to disconnect power feed under load it uses a completely different design
Same size though.
Further update to this if anyone is interested/has suggestions, upon taking apart the CVT it's clearly worn over the past few decades and possibly being crashed as the motor side has multiple cracks/worn keyways and I doubt it can be repaired or spares acquired so looks like I'm gonna have to just find a new motor and use a vfd with the cvt locked.
Yea but unfortunately the lot is impossible to replace without scavenging from another lathe and not repairable due to the fact it's probably cast iron so can't weld (see the terrible casting defect that got approved) and such extensive damage and I don't have the ability to make replacements due to the broaching and grease groves.
brightspark
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How about asking @doubleboost for his advice. He does repairs to cast etc. If you are really lucky he might even take it on for youtube content. I dont think we have that type of project on the channel for some time now.
By the way I think a repair would work as you are not going to be doing 1/2 inch cuts with carbide on a raglan 5 inch.. I used to have one and made a gearbox up for it. But it never got used for screw cutting even then
I gathered that from everyone else saying it and didn't do it anyway as wasn't sure myself when it was lifted month ago lolreal bad idea
The bit with the grease grooves is completely cracked around where it joins the pulley half there's probably 5mm that's keeping it attached, it's so far gone you can open up the crack a few millimetres just with 2 fingersHow about asking @doubleboost for his advice. He does repairs to cast etc. If you are really lucky he might even take it on for youtube content. I dont think we have that type of project on the channel for some time now.
By the way I think a repair would work as you are not going to be doing 1/2 inch cuts with carbide on a raglan 5 inch.. I used to have one and made a gearbox up for it. But it never got used for screw cutting even then
The other piece with the keyways has a crack the full length originating from the keys and it wraps around where it joins the other pulley half.
Even if it was plain old steel that I could tig weld both pieces are too far gone and would warp with the heat.
If I was to make a replacement I could mill the external key slots but only make the internal ones by drilling and making a round pin for a key and would have to skip the grease groves or just make shallow ones by turning a large thread pitch or using a ball endmill in a dremel and manually rotate/feed. All going well they could be remade but I don't have the materials or ability as currently mini lathe wouldn't cope with anything but aluminium which isn't suitable.
I think I'm just gonna take it apart to check for more damage/clean it up and just remove the internal cvt pulley to put a fixed one in and bolt up a 3phase motor with a vfd.
They got a new machine in the food factory with a modern cvt drive in it.
It was a disaster, kept shredding belts and bits of belt got into the pulley slides and wore them out. After many new belts and sets of pulleys, all replaced under warranty we got fed up and replaced it with a fixed speed gearbox powered by a 3 phase motor and used a vfd to adjust the speed.
It wasn't the cost of the repairs, it was the downtime on the machine holding up production.
It was a disaster, kept shredding belts and bits of belt got into the pulley slides and wore them out. After many new belts and sets of pulleys, all replaced under warranty we got fed up and replaced it with a fixed speed gearbox powered by a 3 phase motor and used a vfd to adjust the speed.
It wasn't the cost of the repairs, it was the downtime on the machine holding up production.
Indeed it'll either be cast iron or cast steel. Either way not really weldable. You'd only get a weedy weld.
As you say it has a factory defect in it. Which is most surprising.
It'll work ok with a vfd. It's a bit of a pity because the Raglan variable speed set up is one of the nicest to use.
As you say it has a factory defect in it. Which is most surprising.
It'll work ok with a vfd. It's a bit of a pity because the Raglan variable speed set up is one of the nicest to use.
Seadog
Save the planet. It's the only one with rum!
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Or break it off completely and attempt to silver solder it?
Yea it would have been nice to have it though I still have the 7:1 backdrive Gear setup inside the headstock so with a vfd I'll still get low speed with decent torque and with the vfd I don't have to run the motor to adjust the cvt.
If it was just cracked along the axis then yes as that was the plan but it's completely separated from the rest so not possible.
Its too far gone for repair and would be better leaving it on to solder if that was an option.
The plan is to put a 3 phase 4 pole motor in and use a double v belt pulley setup so the motor 1450rpm gives 2000rpm and for low speed activate the 7:1 backdrive Gear setup.
