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| Bed of nail programmer - resources? |
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| IconicPCB:
in order to achieve resonable pointing accuracy You need to use G10 base material which is at least 8 to 10 mm thick for the fixture base plate. The probes do indeed come in two parts; a receptacle and the probe. These assemblies ( receptacle and probe ) come in a range of sizes down to 0.025"diameter and even smaller. The base plate is drilled using the prescribed drill size. Receptacles are then driven into the base plate flush with the top of the plate .Receptacles have a compression ring on their body whihc is used to hold the receptacle within the hole. A specific drift is neede to drive the receptacles into place. This ensures pointing accuracy of the receptacle. The probes also incorporate a number of features whihc ensure probe pointing accuracy and good electrical contact between probe sleeve and probe shaft. The receptacle can have a crimp connection or wirewrap pin or soldercup for the wire. Nothing majical just common sense. And Yes I have sold and manufactured test fixtures. |
| langwadt:
--- Quote from: IconicPCB on January 14, 2019, 08:27:45 pm ---in order to achieve resonable pointing accuracy You need to use G10 base material which is at least 8 to 10 mm thick for the fixture base plate. --- End quote --- I think stacking a number of PCBs could work, With the cheap protos you usually 5-10 identical PCBs anyway |
| IconicPCB:
Multiple bards would be a reasonable poor mans solution with reduced pointing accuracy. You must keep in mind the probe receptacle is a sitting in a precisely drilled hole which will act on the compression ring of the receptacle. That said 0.1" pitch probes will be quite tolerant of slight misalignments. I am using the probes alone without the receptacles in a single 0.062" thick PCB specifically made for the task without any dificulty. |
| cdev:
I've often wondered if there was some better way to build something like a temporary mini bed of nails, for holding contacts with some pressure onto multiple precise spots on a PCB. Ive seen some solutions which are sold commercially. They're fairly pricey, most of them. |
| langwadt:
--- Quote from: IconicPCB on January 14, 2019, 10:17:10 pm ---Multiple bards would be a reasonable poor mans solution with reduced pointing accuracy. You must keep in mind the probe receptacle is a sitting in a precisely drilled hole which will act on the compression ring of the receptacle. That said 0.1" pitch probes will be quite tolerant of slight misalignments. I am using the probes alone without the receptacles in a single 0.062" thick PCB specifically made for the task without any dificulty. --- End quote --- making the pcb holes the minor diameter of the receptable, using the ring as a depth stop and stacking the pcbs far apart as possible should make it at least as accurate as a pcb |
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