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Harold Hall

Metalworking

Workshop Projects

This is a comparatively simple assembly  as shown by Photograph 16, with only the Slider Blocks needing a little extra care, I will not therefore comment on the other parts.

 

Slider Blocks (34)

Being made from cast iron bar do bear in mind that bar as supplied will need machining to bring it to the 30mm square required being the reason why I quote 35mm square. Do check with the supplier that this can be machined to 30mm as it frequently comes with a large radius on its corners that may make it a borderline case.

 

Machine the block on all six faces to give a 30 x 30 x 25mm block, mark out and drill and tap the holes, other than that shown as 16mm diameter. The important feature is that this hole in each block must be precisely the same height from their base, the actual height being relatively unimportant.

Mark out the position of the 16mm hole in one block only and centre drill. Place in the four jaw and adjust so that the centre drill mark is on centre, testing with a centre in the tailstock will be more than adequate, drill and bore the 16mm hole to be a close sliding fit on one of the posts, Photograph 17. The essential requirement from here is that the two jaws that set the two 12mm dimensions are not moved for the second block. Remove and fit the second block and machine similarly.

 

Test the result by placing one of the posts through both blocks and with them firmly held on some flat surface check that the post can be slid through with ease. See my later notes regarding assembly.

 

Having bored the slider blocks they can be slotted to provide adjustment. However, I found that mine were such a good fit that I doubt if this was really necessary, it will though provide adjustment for wear if required at a later date.

The file carrier assembly starts on the next page.

Oscillating assembly.

Filing Machin, oscillating assembly
Four Jaw Chuck, alternative, using
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16

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17

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