ballnut housing and floating end ballscrew assembly

[dsc]

There's 28mm between the base of the rails and the base of the blocks. 1204 ballbut is 25mm deep, but 1605 is a whooping 40mm, so I'd need 12mm more clearance, it's almost like adding an additional 12mm plate just to get clearance. How do people normally get around this? is it packers / pockets and double plates to get more clearance?

The bolt head can go from the top on both versions of the housing, it's an M4 bolt and I have 8mm clearance on top for the head. Standard head on a caphead M4 is roughly 7.2mm.

Regards,
dsc.

[irving2008]

...

The bolt head can go from the top on both versions of the housing, it's an M4 bolt and I have 8mm clearance on top for the head. Standard head on a caphead M4 is roughly 7.2mm.

Regards,
dsc.

Standard BS EN ISO 4762 spec caphead for M4 is 6.64 - 7.00mm dia.

There's 8mm to play with... seems to me there's plenty of room...

[m_c]

thisonecouldofbeenleftuneditted

[dsc]

Thank you gents, this is exactly why I've asked the question, I've never thought about it to be honest.

Regards,
dsc.

[dsc]

One more question regarding the fitting of the 'barrel' of the ballnut inside the housing. Normally the non-flange part of the ballnut is marked as 'g6' tolerance and if I'm not mistaken it's a slide fit in the housing. Any reason for this other than space saving and making the bore in the housing an almost exact fit? I'm asking because the mounting holes on the flange are 4.5mm dia, which means there's some wiggle room to align the ballnut with the ballscrew, but of course in order for that to be possible, the bore for the body of the ballnut needs to be slightly bigger than g6.

Regards,
dsc.