...
First Release: October 2017 (JD)
Revision A1.0: February 13, 2018 (JD): updated B table offset values for all three work holding methods from 0.885 to 0.836 inches
Revision B1.1: April 19, 2018 (JD): updated description of the ER40 collet system on page 8
Revision 1.2: March, 2021 (QR): Removed sacrificial plate section
Revision 1.3: April, 2021 (KN): Updated M4 screws supplied
Section 1: Pocket NC Vise
...
The adapter mounts onto the B-table of the PocketNC using 2 ⅛ inch dowel pins and 2 M4 x 8 10 fasteners. The adapter can be installed in any of 8 possible positions on the B Table.
...
Place the adapter onto the B table, line up the holes in the adapter with the dowel pins, you may need to wiggle the adapter as you work it down into place. Make sure that you get the adapter all the way down so that it is flush on the B table. Install the M4 x 8 10 fasteners to fix the adapter in place. Tighten the fasteners only until snug, do not overtighten. Overtightening will damage the threads on the B table.
...
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 table and vise setup to accurately represent the set up on the machine. You can find the Fusion file for the vise and table here.
Here is a representation of a sample part being set up for machining.
...
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.
...
...