Milling Alignment Bars.

These alignment bars for the milling machine were not a new idea, they have been published by Rudy Kahoupt and also in the model engineering press.

The idea is to create 2 accurate, straight bars which can be clamped to the milling table to allow quick accurate alignment of parts.

Milling Alignment Bar Parts.









The parts for the alignment bars are shown above. There were 2x straight bars, 4x M10 bolts and 4x M10 T-nuts.









The 2 bars were cut from 5mm gauge plate and were machined on the side faces to ensure they were perfectly square. The holes were drilled to suit the slots in the milling table. The slots on this Dore-Westbury mill were not equally spaced and so the longer bar had three holes to allow it to be used in a multiple positions.

The holes in the bars were drilled slightly oversized to allow the bar positions to be adjusted.









Clocking the first bar.

To use the bars, the first one was located approximately as shown and then it was clocked to ensure it was in line with the x-axis of the mill.









Adding the second bar.

Next, the second shorter bar was clamped at 90 to the first bar, using a square or the DTI again.









Once the bars were set square they could be used to locate objects square to the mill axis. Parts could be clamped to the milling table or against the bars themselves. The bars could also be used to locate a vice.

Having two bars set square was particularly useful when machining several components to the same dimension or drilling holes in the same place on several like parts.