Toolpost Power Spindle

Eddyde

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Looks good, Are you making a tool post grinder?
 
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British Steel

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Looking good, Cascao,

Eddy, I suspect it'll be a milling spindle, big taper rollers and Sturdy Construction - a TPG needs smaller lighter bearings to handle the RPM (e.g. "magneto bearings" here in the UK), particularly for internal grinding where you could be running 20-30,000 RPM.
 

cascao

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I will use an 1800 rpm 1/4CV motor.
With MT 02 arbor, my plans was to use a small chuck from drill press and MT 02 collets I have.
 

cascao

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Great progress this weekend

Milled the keyway and 17mm wrench
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Internal keyway on pulley
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derf

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Are you going to make some sort of indexer for the lathe spindle?
 

derf

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I actually saw that, but didn't connect the two. Will the mill spindle be heigth adjustable?
 

cascao

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The idea is to clamp the spindle with "U" bolts in slots milled on a horizontal plate welded on the base plate shown here

But, if I can't mill the slots, That's my plan B: https://flic.kr/p/zZDH29 [nice 3D movie from my study] tabs behind horizontal plate.
Sem título.jpg
The motor have his own foot.
Maybe I will add one tensioner pulley after. And of corse a belt protection
 

cascao

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Milling the slots previosly done on angle grinder
22655084949_cd7178ef16.jpg

First test with swarf protection on the washing machine motor
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23058479501_da45b4a4a2.jpg

My Sherco observed trials has new brake adjust
23033768922_d79be533e9.jpg
 
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T Bredehoft

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Now that it's assembled (great job, BTW,) how about a 3/8" triangle welded between the upright and the circular base? To add some rigidity, what with that motor hanging off the top.
 

cascao

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Yes, I had this idea too, but it was too much saw work untill now, so will wait some weeks.

This motor was a bit underpowered. Looking for something around 1/2cv 4 poles that fits...
 
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British Steel

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Thanks for the drawing, Cascao, I can see it working for me too (although maybe a bit reduced in size...), I have some nice pieces of stainless bar and very heavy tube waiting for a project like this (although they have a pretty close fit, perhaps good enough for an air bearing), and a spare 3/4 HP DC motor...

I agree on adding some triangulation to brace the plate to the base, should give a big improvement in rigidity and that will in turn improve the finish you can get :)

Dave H. (the other one)
 

cascao

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Replaced the V belt to one round PU belt. Much more power now.

23263525014_2b47f4569f_z.jpg
Surprised how good this philips grub screw was

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cascao

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Update:
After a break in period, the spindle now produce less heat and has mode free spinning beside maintening bearings preload.

Have aded a computer fan to the wash machine motor since it was heating a lot and the fan wasn't helping much

The round green pu belt keep breaking at "welded" joint. Returned to less effective V belt.
 
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4GSR

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It's a shame that your country won't let you buy what you really want abroad and bring it in for your needs without paying very high tariffs on importing. And even then, you don't know if you will get it or some customs official keeps it to himself in the process!

Great job you have done there with the available sources you have there. We love pictures, too!
 
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