Machining the slider block

The drawings call for the sides of the slider block and the bore to be "closely parallel". I decided to reverse the suggested machining sequence and bore the hole first. I was more confident of truing up the sides to the hole afterwards rather than the other way round. Having bored the hole, I mounted it on the slider bar on two vee-blocks and placed a stout piece of bar with two set screws threaded in, underneath to support it. By screwing the bolts in and out as rudimentary jacks, I was able to align the first face horizontal in the Y-axis. I then machined the first face to the required size. This face can be seen facing towards the camera front in the photograph, where the block is set up using an engineer's square against this face prior to machining the second face at 90° to the first. (You can also see where I managed to drill into the mill table with my over-enthusiastic drilling of the block, before boring, despite using a sacrificial piece under it! Memo to self - keep one eye on the DRO, one eye on the work and a wary eye on everything else.)

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