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Thanks Mactec54,
From what I can see here and a couple other sites, my guess is the situation is as you say in your last sentence, they are using a standard AC 3ph motor and a Sensorless Vector...

Thanks Al

After looking around this site I realize I should specify that I'm asking about smaller, hobby machines, (Tormach, etc.)

I see advertisements for machines using Vector drives for powering spindles. These are 3 phase motors driven with VFDs.
Is this a description of the motor or the VFD or are they both of special...

An hour south! Must have a Batmobile.

Well Ian, you would have lost the family jewels.
No leaks, but no float.
The unexplained symptom of increasing pressure causing increased difficulty turning still exists. It has lessened, but...

On post #88 You'll see that I only have .001" at the most and some of my measurements show only .0003"
The inside of the bushing looks pretty shiny. The shaft looks a bit weird. It's all shiny but...

The Permatex takes 48 hours to fully cure so tomorrow might tell a tale.
As you mentioned a few comments back, this is not rocket science. The differences between your Weldon and Cuttermaster...

Great picture looking own the Cuttermaster bore, Ian.

I put air to my Weldon rig this afternoon but there is still no joy. Air escaped from one side of the housing-bushing joint.
The spindle was...

The sealer is sticky right now, after about 20 hours. I don't think it will harden but it still might seal.
Tomorrow I'll put the air to it, trying to remember to cover it; might blow out ugly.

I...

The spindle is definitely bent, the only question is how much and is it a relatively sharp bend. Near the center i read .003 TIR, but in that same setup I was getting .0008" TIR at both ends. Both...

I got out there long enough to do a little.
I turned the exterior bushing groove to over an inch wide and a smidgeon deeper. That means the air path is grater than the supply tube.
I installed it...

Yes the Weldon parts are quite hard and amazingly the manual says that after the tool wears some you might need to increase the air pressure! Wear, what wear?

I've thought about the machining
If...

The AL is worth half as much.

It's almost 4pm here; only half the floors scrubbed and the old guy is tired. Taking a break that might turn into quitting for today.

With all the air going to the middle, Weldon style, it's...

Specs on Bronze I bought.
Bronze Cored Rod Round Stock Bushing Material 2.27" OD x 1.645" ID x 6-1/8" OAL

The piece of steel tube I have is 1.750 OD so if I do both they are a good match
The...

Pictures look same as mine.
I didn't get out to my shop/garage yesterday, but I did get the seller of the piece of bronze to part with it for $31 including shipping!

I've looked at dozens of...

Actually I see some bronze bushing stock on Ebay the exact right size to make a new bush. $40. I won't bite now, I have both aluminum and steel stock that would be good. Tempting though.

I spent only a few minutes on the Weldon today, busy solving probing problem on the mill.
I did some measuring. The inside of the air nipple is about .265", so three 1/4" holes through the bushing...

I've known about the Duclos unit long before I bought the Weldon, so when I saw a Weldon with an auxiliary base for little money, I figured the castings alone were worth the dollars. So, from the...

Ian, so glad you're here because bouncing ideas to someone makes my brain work better. What I wrote in the last post got me thinking, "distorting". My bushing is not a press fit, it is a snug fit....

Alright, suppose the air outside the bushing is high and the inside too low. That doesn't tell me why the spindle locks up. Yes maybe it won't float that way, but why/how the lock??
I could seal the...

I too have had the thought of the pressure shrinking the bushing but dismissed it, thinking "no way". I've also had the thought that air passing around it might lower its temperature a few degrees...

I'm almost 80 and just a hobby machinist. My daddy was a tool maker in the late WWII days. I believe he would have measured those bores with a inside spring loaded caliper with finger nut. I still...

Thanks Ian

Ian,
Are these holes in the surface that touches the spindle, or in an undercut?

Roger, please read the first post. 4 tons of pressure and heat.

Again I spent just a short time today with the Weldon.
I cut a shallow groove around the outside of the bushing, centered. I drilled a hole through the bushing wall at the top. After cleaning and...

I have a T&C grinder along with some fixtures. For the time I've had it I've done little grinding. I have everything to enable me to sharpen cutters, I just thought having a working Weldon would be...

I spent a little time with this project today; learned a little.
The spindle can be cut with a carbide insert. At 400 Rpm I did a tiny nick cut, the chip ribbon lit up bright red, cooled to a nearly...