Re: Dema.RAL tamper discussion
Click-Mats dont work that well with tamper stands.
It could be made simpler than the Espro by just having a spring mechanism using a 10N/mm rate spring with 11mm of preload and 1mm of alllowed movement between the tamper shaft and the disc. Then as soon as the shaft began to move independantly of the disc, you would know that you had reached 110N of force (assuming that the length has been set long enough not to bottom out) and when the shaft and disc lock again then you would have reached 120N of force on the puck. Both points should be pretty easily detectable so you only have a small range of error if you tamp until the shaft/disc assembly begins to compress.
I feel that adjustability of the force isnt necessary as the key is consistency but by allowing for the preload to be adjustable, you would be able to vary the force range indicated by the tamper (of course, adjustment would add further complexity/cost).
Originally posted by 644345424F360 link=1227148434/88#88 date=1271313096
It could be made simpler than the Espro by just having a spring mechanism using a 10N/mm rate spring with 11mm of preload and 1mm of alllowed movement between the tamper shaft and the disc. Then as soon as the shaft began to move independantly of the disc, you would know that you had reached 110N of force (assuming that the length has been set long enough not to bottom out) and when the shaft and disc lock again then you would have reached 120N of force on the puck. Both points should be pretty easily detectable so you only have a small range of error if you tamp until the shaft/disc assembly begins to compress.
I feel that adjustability of the force isnt necessary as the key is consistency but by allowing for the preload to be adjustable, you would be able to vary the force range indicated by the tamper (of course, adjustment would add further complexity/cost).


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