Re: Tortoise Auxiliary Switches
Posted: Thu Sep 10, 2009 10:41 pm
How not to develop a product!
I did finally get a batch of replacement pcbs made and have upgraded 8 Tortoises so far. What I'm doing is swapping the pcb (which takes a very few minutes), securing the wipers to their arm with one 12BA nut and bolt on each and bending the wipers so they are all of a similar shape and pressure.
An interesting discovery is that one of my Tortoises is clearly Circuitron's second attempt to get the pcb right (Rev B being their third). The pcb is labelled just 'Rev' and is as poorly aligned as Rev B but in the opposite direction. Goodness knows what their first attempt was like.......
Something else to be unhappy about in this earlier Tortoise is that the idler gear stub axles are barely long enough to engage in their bearings. The Rev B ones are a sensible length.
So my plan is to re-engineer all my Rev B Tortoises as described above, not use the earlier 'Rev' Tortoise (keep it for some spares) and probably only re-engineer Rev C Tortoises when used on running lines. Incidentally, label colour is not a good guide to which Rev a Tortoise is - go by the pcb which, outside the case, should have only the number '1' on it if it's Rev C (or later).
Andrew
I did finally get a batch of replacement pcbs made and have upgraded 8 Tortoises so far. What I'm doing is swapping the pcb (which takes a very few minutes), securing the wipers to their arm with one 12BA nut and bolt on each and bending the wipers so they are all of a similar shape and pressure.
An interesting discovery is that one of my Tortoises is clearly Circuitron's second attempt to get the pcb right (Rev B being their third). The pcb is labelled just 'Rev' and is as poorly aligned as Rev B but in the opposite direction. Goodness knows what their first attempt was like.......
Something else to be unhappy about in this earlier Tortoise is that the idler gear stub axles are barely long enough to engage in their bearings. The Rev B ones are a sensible length.
So my plan is to re-engineer all my Rev B Tortoises as described above, not use the earlier 'Rev' Tortoise (keep it for some spares) and probably only re-engineer Rev C Tortoises when used on running lines. Incidentally, label colour is not a good guide to which Rev a Tortoise is - go by the pcb which, outside the case, should have only the number '1' on it if it's Rev C (or later).
Andrew