Polishing machine spindle adaptors?

[daxliniere]

I picked up this polishing unit yesterday and all it cost me was a 2 minute detour on my way to work.

It's got a 500W motor, 2 speeds and seems to run nicely.

I have plans to put a deburring wheel on one side and some kind of grinding wheel for HSS tools and drills.
I tapped M8 threads into the pairs of holes to mount a guard and also a coolant catcher for the grinding wheel.

It only came with one of the spiral spigot-y things and I'm not set up to be able to make one of my lathe. (Let alone having the skill to do the taper.)
Anyone know what they're called and if they're a standard size or custom to each machine?

 

[Brad93]

I picked up this polishing unit yesterday and all it cost me was a 2 minute detour on my way to work.

It's got a 500W motor, 2 speeds and seems to run nicely.

I have plans to put a deburring wheel on one side and some kind of grinding wheel for HSS tools and drills.
I tapped M8 threads into the pairs of holes to mount a guard and also a coolant catcher for the grinding wheel.

It only came with one of the spiral spigot-y things and I'm not set up to be able to make one of my lathe. (Let alone having the skill to do the taper.)
Anyone know what they're called and if they're a standard size or custom to each machine?

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You'd need a taper turning attachment to do that thread on a lathe.

 

[The_Yellow_Ardvark]

They are a few sizes.
Machine Mart used to do a few.

 

[Seadog]

Anyone know what they're called

I know them as pigs tails.

Here's one that I made a couple of years ago.

 

[Agroshield]

Anyone know what they're called...

As Seadog says, 'polishing pigtail' is a good search term. They come in left hand and right hand thread to suit the side of the spindle on which they are mounted. You might have to buy something with a smaller bore and drill it out to suit the spindle you have. You can see that they lock onto the shaft with two grub screws (put a brass plug or piece of copper wire under the grubscrew so not to marr the shaft).

 

[Theblackbox]

Pig tails.

Thepolishingshop.Co.uk will have them in stock. Or molderoda

 

[Rrobson]

Can be done without taper attachment if your careful. I made a pair for my bench grinder on a machine without taper attachment.
The adapter for the left hand side of the grinder is ok because your threading left to right down the taper. I’d doesn’t matter if your a bit heavy handed with the depth of cut because the taper naturally reduces the cut as it progresses along.
The adapter for the other side is more awkward because you threading right to left up the taper. You’ve got to be quick if the depth of cut starts getting excessive!

Plenty of these on eBay and the likes but the spindle fit wants to be good…

 

[daxliniere]

Thanks everyone. I'm wanting to put a solid grinding wheel (for HSS lathe tools) on one side and that will need something other than a pigtail.

Any suggestions on this? I may just buy another pigtail, cut off the spiral thread, weld on a piece of bar and cut a thread on it. Seems like a lot of work so was hoping to find this part off-the-shelf.
Having a tool grinding wheel with a coolant bath would be a really great thing to have in the workshop.

Looks like the angle is 1.3322°

 

[Rrobson]

Yes, dont.
Your tool is designed for polishing, not off hand grinding. You can’t hold a wheel securely and you risk running the wheel out of balance and therefore exploding or coming loose. Not to mention there are no guards and no tool rest.
For your own sake, just buy another grinder designed for holding the wheels you want to use.

 

[Agroshield]

Yes, don't.

Completely agree.

A proper grinder retains the wheel by means of a nut on a threaded shaft (again, LH thread on LH side). The shaft also needs a shoulder on it to retain the flange nearest the motor body, as well as an identical flange on the other side of the wheel. The flanges themselves are relieved, so they only press onto the wheel at their perimeter. All wheels need paper washers between flange and stoney bit.

Stick with two of the following on the machine: Scotchbrite wheel, wire wheel, polishing mop.