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Step 1 – Board Preparation:
The Euclid Probe kit will arrive in a small zip-sealed baggie. Beware, there are small parts that can be easily lost.
The kit contains the PCB set, screws, SMD nuts, a switch, magnets and wiring connectors.
Leave the two PCB’s attached to the rail for now. It will aid in the solder assembly of the components. Determine how you will be attaching the upper tool board PCB to your carriage.
EDIT 10/1/2021: Added to the kit are 2-M2.5, Phillips head plastic screws for attaching the toolboard to the mount. We are in the process of revising the mounts to resize all the holes. We are annotating the mounts as we revise them. If the mount you need is not yet updated, send us an email at firstname.lastname@example.org and we will expedite the .stl to you.
- The mount holes are drilled thru 2.5mm⌀, for the purpose of acting as pilot holes for threading with an M3 tap. Screws would secure it to your mount from above.
- The holes are positioned such that if heatserts were in the carriage, there will be sufficient cover in the margins between the JST connector housing clearance hole and the inserts.
- There is sufficient material in the PCB to countersink the screw holes to use flat head screws for a flush installation to threaded holes.
- The most common attachment method is by using M3 button head screws from the underside. This will require drilling the mount holes out to 3mm⌀.
- You may want to print out the guide block that we have designed to align an M3 tap or 3mm⌀ drill perpendicular to the toolboard.
Step 2 – Board Assembly:
Install the wiring connector to upper tool board. This PCB has the outline of the JST-XH socket header printed on the backside and has the surface mounted components installed to the front side. Install the connector from the backside of the board so that all the thru-hole soldering will occur on the front side.
Install the switch to the probe board with the footprint labeled
SW1. Install the switch from the backside. Note the pin labeling on the PCB silk screen printing. The recommended switch orientation is such that the plunger is oriented towards the blunt end of the board. On most switches, the COM pin is on the side of the plunger. This centers the plunger’s action in line with the fastening screws above and minimizes any eccentric forces on actuation. It is important to fully seat the switch against the PCB when soldering. This eliminates any potential lateral movement of the switch due to bending of the soldered pins, maintaining the best possible probe accuracy.
- It is helpful to use a dot of superglue to attach the switch and the connector the board before soldering.
- The pre-glued components will aid in keeping the PCB’s inverted and stable for hand soldering.
- The straight male pins may be interchanged with the socket header to use the Dupont style connector.
Solder the switch and connector to the PCB boards.
After soldering you can clip the excess length of the solder pins. It is suggested to insulate the exposed terminals of the top side of the probe PCB by placing a piece of Kapton tape (not included) or similar non-conductive material to insulate the exposed terminals. Nail polish or model enamel works well too.
Step 3 – Magnet Preparation
In the kit there are 4, M2x0.4 by 5mm long screws, 4 countersunk magnets and 4 SMD nuts.
The proper orientation of the magnets is such that the probe will only couple in one specific orientation by opposing the magnet’s polarities.
It is helpful to separate and organize the magnets into pairs to ensure the polarity is maintained during installation.
- Remove the magnets from the shipping holder, one at a time.
- Insert one of the provided M2 screws into the countersunk hole of the magnet.
- Insert a screw into the countersunk hole of the mating magnet.
- Join the two magnets, face to face so that the screws are trapped in their countersinks.
Prepare the remaining 2 magnets similarly.
Step 4 – Magnet Installation
The magnets area ideally orientated so that their poles alternate fore and aft on the board. This way, when the tool approaches the probe in the dock, the leading magnet’s polarity is opposite of the first. Since these two magnets are of the same polarity, they are repulsed, pushing the probe into the dock and allowing the tool to pass over. When the tool aligns with the second magnet, the probe will be lifted in the dock and couple with the tool.
Split one of the magnet pairs and place the screw|magnet combination onto the tip of a small Phillips screwdriver. The magnetic force should hold the combination on the screwdriver.
Place the shoulder of one of the SMD nuts into one of the holes of the PCB from the same side that the switch was installed from. Push the nut fully into the hole and screw the magnet into the nut. Tighten the screw snug tight. The SMD nut is shallower than the PCB thickness and tightening the screw will cause the magnet to bear against the plated hole, creating the electrical connection.
The magnet should now be protruding on the opposite side of the PCB board from the switch.
Install the remaining magnet and SMD nut similarly into the open hole of the Probe Board.
Separate the top boards from the PCB rail that joins them by flexing them so that they crack between the mousebites holes drilled in the PCB. If the rail remains attached to one of the boards, it can be removed with flush cutters later.
Separate the remaining magnet pair and place the magnets on their mates already installed on the probe board. Doing this ensures that the proper orientation will be achieved. The M2 screws should be captive in the countersink cavity and the threaded ends protruding from the backside fo the magnet.
Place the tool board PCB over the probe board with the screws going through the holes for the SMD nuts. Install the SMD nuts on the screws. There should be enough magnetic force and friction to hold the screw so that the nut will start on the screws. Tighten the nuts as much as possible to secure the magnets so that you can swivel the boards apart, pivoting on one magnet, then the other, using the small Phillips screwdriver to tighten the screws.
Slide the toolboard and the probe board apart through the plan of the magnets and tighten all the screws snug tight.
Step 5 – Magnet alignment check:
Place the two boards together and verify that the mating faces are drawn together.
Grasp the pair of coupled boards between your thumbs and forefingers and try to rock them side to side. If any of the magnet faces are not coplanar, you might feel or hear a slight clicking.
If you believe that this is present, try to identify the pair that is suspect, loosen the fixing screw on one of the magnets, rotate it slightly and re-tighten. This usually takes care of the problem.
Next Step: Probe Dock & Toolboard Mount ⇨