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projects:welcome [2017/11/14 19:45] jerzydziewierz |
projects:welcome [2017/11/27 19:58] jerzydziewierz readability |
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The machine itself is very robust. | The machine itself is very robust. | ||
- | It is likely approx. 40 years old, but for what it is, it has seen only a very light use. It was used to guide an ultrasonic probe in a water tank. The base, and the bridge is solid steel; it is very rigid. It weights no less than 300kg. | + | It is likely approx. 40 years old, but for what it is, it has seen only a very light use. It was used to guide an ultrasonic probe in a water tank. The base and the bridge is solid steel; it is very rigid. It weights no less than 300kg. |
There are no driver electronics whatsoever, but there is: | There are no driver electronics whatsoever, but there is: | ||
- | * high precision rails on both axes. No play. No rust, no damage. Noiseless. | + | * High precision rails on both axes. No play. No rust, no damage. Noiseless. |
* Linear motors. These are noiseless. Known coil resistance: 14 ohms. Tested working with 2A current, although, we'd have to test how much can they take before overheating. Ideally, they need onboard temperature monitor. | * Linear motors. These are noiseless. Known coil resistance: 14 ohms. Tested working with 2A current, although, we'd have to test how much can they take before overheating. Ideally, they need onboard temperature monitor. | ||
* Ultra high precision linear encoders, with a sine-cosine output. Tested works OK at 5V supply. | * Ultra high precision linear encoders, with a sine-cosine output. Tested works OK at 5V supply. | ||
- | * elastic covers | + | * Elastic scarf on both axes. This makes it a very pro-looking machine |
+ | I believe it can still serve the good of humanity for many years to come. | ||
== What is missing: == | == What is missing: == | ||
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* We need to build the servo amplifier and the motion controller for it. Budgetary cost ~~200gbp | * We need to build the servo amplifier and the motion controller for it. Budgetary cost ~~200gbp | ||
* We need to build a motion controller for it. *machinekit* has been suggested. As far as I understand, the club has a beaglebone black waiting for such opportunity. | * We need to build a motion controller for it. *machinekit* has been suggested. As far as I understand, the club has a beaglebone black waiting for such opportunity. | ||
- | * We need to supply an end effector - e.g. 3D printer head or other. | + | * We need to supply an end effector - e.g. 3D printer head, or other. |
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At this point, there would be no noise, no dust, no vibration e.t.c. | At this point, there would be no noise, no dust, no vibration e.t.c. | ||
This is because: | This is because: | ||
- | * the machine is not actually operable. The servo amplifiers are missing and there is no end effector on it. | ||
- | | + | |
- | * When we are ready to install the end effector, this will be the point to consider the amplitude | + | * When powered, the movement |
- | * for a 3D printer head, we can all agree that regular ventilation & noise would be acceptable. Possibly, keep the window open to prevent accumulation of fumes. Otherwise, | + | When we are ready to install the end effector, this will be the point to consider |
- | | + | |
- | | + | |
- | | + | |
- | * a spark erosion processor: In such case, there is no dust, no noise, and the end product could be of extremely high quality (injection moulds are often finished with this technique). This method is limited by the available electric power, and in general, very slow. EM interference can be managed by enclosing the working area in a Faraday cage. Budgetary cost: Unknown, but no less than 500gbp. | + | |
+ | |||
+ | * A spark erosion processor | ||
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[Bob]: H&S? | [Bob]: H&S? | ||
- | [Jurek]: I to have to give You that this machine could potentially be an H&S issue. It has heavy moving parts. There is no sharps, but there is a potential for finger capture if one puts his finger into just the right place at just the right time. | + | [Jurek]: I do have to give You that this machine could potentially be an H&S issue. It has heavy moving parts. There is no sharps, but there is a potential for finger capture if one puts his finger into just the right place at just the right time. |
- | The risks are mostly similar to the ones coming from a regular 3D printer (that is already | + | The risks are mostly similar to the ones coming from a regular 3D printer (that we already |
To mitigate this risk, we could: | To mitigate this risk, we could: | ||
* (proposal 1): Build it into a lockable cabinet to make it even more obvious that it is not to be messed with. | * (proposal 1): Build it into a lockable cabinet to make it even more obvious that it is not to be messed with. | ||
+ | |||
* (proposal 2): Instead of a cabinet, we could install a nightlatch on each of the two heavy axes: https:// | * (proposal 2): Instead of a cabinet, we could install a nightlatch on each of the two heavy axes: https:// | ||
+ | |||
+ | Since it is ours, it is OK to drill and tap holes. We can modify it any way we want. | ||
+ | |||
== Risk: How to remove it from the club after the interest wanes out == | == Risk: How to remove it from the club after the interest wanes out == | ||
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[Jurek]: I must agree with this. | [Jurek]: I must agree with this. | ||
In order to mitigate this risk, | In order to mitigate this risk, | ||
+ | |||
* (proposal 1): I suggest that we start a fund, to be held by the CCA, in which there will be a deposit to cover the machine’s eventual disposal. I guess we might need to find somewhere in range of 300gbp . | * (proposal 1): I suggest that we start a fund, to be held by the CCA, in which there will be a deposit to cover the machine’s eventual disposal. I guess we might need to find somewhere in range of 300gbp . | ||
+ | |||
* (proposal 2): Another method might be to get an official quote from one of the scrap metal collectors: | * (proposal 2): Another method might be to get an official quote from one of the scrap metal collectors: | ||
https:// | https:// | ||
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+ | --------------------------- | ||
====== Wooden CNC Machine ====== | ====== Wooden CNC Machine ====== |