...
First Release: October 2017 (JD)
Revision A: February 13, 2018 (JD): updated B table offset values for all three work holding methods from 0.885 to 0.836 inches
Revision B: April 19, 2018 (JD): updated description of the ER40 collet system on page 8
Revision C: March, 2021 (QR): Removed sacrificial plate section
Section 1: Pocket NC Vise
...
DO NOT OVERTIGHTEN! You will damage the B-table drive system if you use excessive force when tightening the collet nuts.
Section 3: Sacrificial Plate
...
The third way that you can mount stock on the Pocket NC is with the sacrificial plate.
The sacrificial plate is 4 inches in diameter and made of 6061 Aluminum. It is has slots pre-cut for M4 hex nuts and fasteners to allow unusually shaped parts to be mounted in a variety of ways. The table is also soft enough to be drilled/machined by the user to customize it if needed.
...
The sacrificial table is mounted to B table with two ⅛ inch dowel pins and two M4 x 8 fasteners. Insert the two dowel pins into the unthreaded holes on the B table that are furthest from the axis of rotation. Make sure that both the B table and the underside of the sacrificial table are clean of chips and burrs, Install the sacrificial table making sure that it is flush against the B table. Install the two M4 x 10 fasteners and tighten till snug. Do not overtighten. A good gauge of an appropriate level of tightness is to tighten the screw with a 3mm hex wrench only to the point that the wrench starts to flex.
...
Use the provided fasteners or any other M4 fastener to attach work pieces to the table directly, with hold-down clamps, or with a custom fixture. Make sure that your stock is in the same location relative to the Pocket NC’s center of rotation (B table offset) as it is in your model. The edge finding tutorial found on the V2 resources on the Pocket NC website may be helpful for accurately locating the part.
Here you can see the sacrificial plate installed in the B axis table within Fusion 360.
...
The origin of the machine (X0 Y0 Z0 A0 B0) is represented as a black line centered on the B table. The end of that line is 0.836 inches above the surface and is the machine origin point. Material can be placed within Fusion 360 using the this model of the sacrificial plate to accurately represent the set up on the machine. You can find the Fusion file for the B table and sacrificial plate here.
An example of how stock can be mounted onto the plate using the M4 screws and nuts is shown below.
...