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For the z ball screw bracket I’m going to use two pieces of plate and weld them together. There isn’t a lot of room in the casting slot so I’m going to have to grind off excess casting. It varies quite a bit. I’m also going to add an aluminum plate on top of ball screw nut for oil fitting and brush. The brush was sent loose with no way to attach it.

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Finished z balls screw bracket. Clearance was issue. Grinder got real work out.

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Z spindle bracket complete I’m able to attach spindle plate and bolt top ball screw bearing bracket to the top plate.

[grg_p]

Mounted servo for Z ball screw.

[grg_p]

With the column now on base I needed to make covers for the X cars. Facing upside down I had to cover them to keep them from getting full of chips. My chip drawer had to be changed from my my original designed flood coolant tank and pump. Originally I was going to use air pump but it didn’t have flow that I’m looking for. The drains holes for coolant when washing chips down would allow coolant to miss draw so I had to add defectors on bottom of enclosure tray. I made motor covers and tray for X servo motor and Y motor. I’ve seen pictures of Tormach motor cover being used for tool tray and copied the idea.

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I finished mounting x servo motor.

[pankniru]

For CNC machines retrofitting services contact me at [email protected]/ +918168294379 (whatsapp)

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I looked at a lot of different counter weight options and they all work but I want to be able to have adjustability. Getting gas spring exactly right in my experience is 2 to 3 sets. I don’t have room to hang weight off the back. So I going to use torsion springs. My spindle is going to weigh 150 plus so I settled on overhead door springs. They will give me the adjustment flexibility that I’m looking for. I also going to use this 3/4 hp submersible pump for flood system.

[joeavaerage]

Hi,
why bother? Is your Z axis particularly heavy? The whole point of having a ballscrew is to convert a small torque exhibited by the servo/stepper and have that translate into a much MUCH
greater force, albeit at a slower speed.

A 5mm pitch ballscrew (note: does not depend on diameter) will exert 1250N (125kg force) of thrust for every 1Nm applied.

My 750w Servos are rated at 2.4Nm, so even if my Z axis including spindle and headstock weighs 125kg, the about 1/3 of the servos torque is required just 'to hold it up' but leaves another 1.4Nm to
accelerate it.....more than enough. I am in the process of fitting a new spindle (3.5kW, 380VAC, 40,000rpm) weighing 22kg, and another 12kg for the mounting block Over the next month or so I hope to have cast (in grey cast iron) a new
headstock which will weigh 50kg. That will bring my Z axis weight to about 94kg including the Z axis saddle, scarcely enough to even bother my Z axis servo. I do not have a counterweight or
gas springs at the moment and neither do I plan on having them when I fit my new spindle.....any day now!!!

The spindle monitoring, air solenoids and circulation pump are nearly done.

Craig

PS: Correction, just had a phone call to tell me that the 24VDC coils for the Seal Air and Taper Blow air solenoids have arrived from Auckland......so all the bits I need to fit my new spindle are done.
Been a long time coming, had a real battle and hiccupp with NZ Customs (my fault) when the spindle came into NZ, and there is always other new bit to buy!!!!