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Sure, but in french:
coupleur flexible moteur PAP : Discussions générales sur la conception - Page 2 made from PCB epoxy, quite big due to it. Stainless steel is often used for commercial ones.
...

Why don't you go with plain tortional disc coupling? they can be made DIY and are true backslash free coupling.
Quite bigger than oldham in diy version, but not more complex and they can handle...

Can be even worse, as R8 has more overhang than MT3 for example (see R8/MT3 X2 spindle difference on LMS).
MT is prone to cone grip, you definitely need an ejector nut for it (could be build...

Problem is that PATA is like LPT, on the verge of extinction

I have already post the thread of this mill.

I have made a small trip to see it. Lucien (the builder) is a former owner of a metalworking company so he knows his trade. He decided to build this...

Worse thing about GPU is that it's closed source driver. Closed source drivers and RTAI/EMC2 are not playing well together by experience.
You can spend a lot of time porting RTAI or other RT kernel...

Sorry, It's a 1/2HP motor. I did the prototype with a 250w motor I had on hands (same dimension), but ended purchasing a 370w.
Pretty much the same power as orignal X2, maybe better in low speed due...

I have modified my X2 with 3ph motor. A simple 1/3Hp one. With a vector drive VFD and a belt reduction(about 1:2.2).
Motor size is the main constraint, difficult to fit anything bigger than 63mm...

6" is too big for X2, unless you work on very thin part and do not use a chuck on it.

I have a vertex HV4. Very nice and good finish. Compatible with Soba dividing disks.

Flex in column
Gear train will break
Simple deep groove bearing
Undersized gibs
CC motor: can overheat quickly


The good news is that most of these flaws can be corrected: column brace,...

MT3 spindle has the same bearing size on top and bottom (30x62). For R8 you will need different bearing on the bottom, 32007 I guess (35x62x18).

Bearings are unamed 30206 bearings, I have some timken in stock but never mounted them.

Other part (shields) are custom made in aluminum with a teflon ring to provide little sealing (without...

I have made modification on my X2 to use tapered roller bearing instead of standard depp groove bearing (morse taper spindle, 30206 bearings)

What you must do:

Polish the upper bearing race to...

And if you look closer at the label, it's rated 1.5HP continuous, and requires external fan unit for cooling.

Stop hammering the poor head. It will only destroy bearings.

What kind of tool is stuck? is its diameter below the spindle nose diameter? #
If so, use a metal tube, or two block of same size,...

You can also use a standard 3 phase AC motor with vector drive inverter. Maybe a little more heavy/bulky and limited to 3kprm@50hz. I have a 3kprm which is running at 5k without any trouble.

80...

I use a 30X tapmatic head on the X2. Perfect fit (only up to M7 - 1/4").
This make taping a pure joy, never snap a tap again, even in blind hole.

btw, the design proposed is very close from X2 R8 design, except that the X2 use two regular deep groove bearing.

And I have already upgraded my CM3 X2 bearings with taper ones, nothing like P4/P6...

If you look closely an X2/X3 spindles you will see that they are not heat treated (file bites easily), they are made from pre-treated steel like 42cd4.

I have one spare X2 R8 spindle shaft. First...

I do that often to avoid, mainly because of CM3 spindle.
You do not need spindle lock at all with ER tool holder, just buy one with wrench slot on the holder body.
But it's quite tedious to lock a...

It's correct practice, but not mandatory.
On my asian BV20 lathe, I had a microswitch wire from the leadscrew gears doors that get in the way of a gear. Since it carried 220v live, the result was an...

Hi,

You have to program your VFD with the spindle parameters:
Motor freq: 400Hz
Motor Voltage: 220v.
Motor Amps: 6.5A

I do not know fuji VFD so I can't help you on this.

The reason you...

Like said before, go ask ZX-45 sellers for replacement part. There is virtually 0 market for selling spindle box only. Or you can directly contact chinese factories to get one.
Another solution is...

DM ITALIA MACCHINE LEGNO E METALLI Italian vendor.

Not exactly 9x20, but they have BV20-L1 and BV25 which are ok (I have a BV20-1).
No gearbox for leadscrew, but real gearbox for the spindle (no...

PE do DXF import/export, I use this to modeling THK rails from their DXF drawings, no problem so far (reusing into a sketch only need automatic repair to be sure everything is closed).
The only...

Thanks to google I have been able to find the original thread on rcgroups:
RC Groups - View Single Post - DIY CNC Router for modelers

My design is a little bit different (angular bearing on...

I use this motor because it has a 8mm shaft, meaning that it's fitted directly to a 8mm ER11 spindle.
This allow a compact design without any coupler with added fan on top.
It's not only for pcb...

hobbyjing motors... Do not take power rating for "continuous". It's basically max rating. You have to derate a lot this rating. And do not forget that it's power input, not output, you have to take...

Don't forget that most R/C motor are rated for 15/30min max running time with plenty of air cooling, it's a very small service time.
Some small R/C motor (especially chinese ones) even burns when...

What kind of rail? this is more important than size.
Four point HSR can hold load in all direction, SR not.
A bigger rail can hold higher load, wider rail can hold higher load in some direction,...