Myford Z axis

Wednesday, 07 June 2023

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Myford Z axis


Myford Super 7 z-axis ball screw conversion

Below are photographs of all the parts involved in converting the z-axis and the process of fitting them to the lathe.  Click on any of the thumbnails for a hi-res, detailed image.

All the parts

This is the complete set of parts for the Z-axis

Ball nut mount

The ball nut is an off the shelf component. It has 1.5mm machined off one end for clearance and the M4 tapped holes have been extended all the way through the block.

Ball screw cover adapters

The ball nut mount is combined with adapters to attach the bellows that protect the ball screw from chips.

Ball nut unit complete

The ball nut and screw are assembled into the mounting block complete with the cover adapters.

Covers in place

This is the ball screw and nut with the covers in place

Saddle adapter

To connect the ball nut to the lathe's saddle you need this rather complex block. Gauge blocks are needed to get the thckness correct and avoid bending the ball screw.

Saddle adapter

The bottom surface is machined to clear the ball screw covers.

Saddle adapter added.

The saddle adapter is bolted tot he top of the ball nut mounting block.

Motor mount

The motor mount (MBA10-C) and ball screw fixed end bearing (FK10) are combined with another adapter to attach the motor end of the cover.

Ready to fit to the ball screw

The motor mount/fixed bearing is ready to fit to the drive end of the ball screw.

Motor mount in place

With the angle contact bearings under tension, the motor coupling is added and the ball screw cover attached. Remember to oil the ball screw first!

Floating end

The floating end bearing (BF10) is fitted with a simple turned adapter for the remaining ball screw cover. The adapter is simply glued in place in the BF10 bearing mount.

Ready to fit

The complete z-axis is now ready to be fitted to the lathe

Lathe mounting plate

The z-axis conversion is mounted to the lathe using alloy plates bolted to the lathe bed where the manual rack used to be.

Headstock end

There's a similar arrangment at the headstock end. The plate stops flush with the end of the bed, so doesn't interfere with oversize face plates.

Floating bearing in place

The floating end of the ball screw is bolted to its mount.

Same at the rear.

The motor mount bolts to the plate at the tailstock end.

Saddle adapter bolted to saddle

The saddle and its adapter are bolted together in the same way as the original apron.

Add the motor

Finally the stepper motor (Nema23) is bolted to the back of the motor mount and the coupling is tightened.

Clearance is clearance Clarence!

The saddle adapter passes 0.25mm away from the mounting plates. Achieveing this clearance is the reason why the ball nut mount needed 1.5mm removed from one end. The bolts that connect it to the saddle adapter make it difficult to have much more clearance than this.



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This site was last updated 09/06/19