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Steven Yaeger
Oct 13, 2013, 8:59:14 AM10/13/13
to Extrus...@googlegroups.com
This week, I received my heater band from Mark. And today I got some time today to work on the ExtrusionBot.
The thermocoupler mount seemed flimsy. And I wasn't sure how it would hold up to temperature changes. So I reinforced the mount with a band clamp and a 1/4 inch x 20 thread count nut. I drilled a 1/4 inch hole in the band clamp for the thermocoupler to pass through and positioned the nut directly under the hole, and on top of the existing thermocoupler mounting point.
The nut was a little too thick to sit entirely on top of the band clamp, and allow the thermocoupler to reach all the way to the pipe. The full description of what I did to make the nut fit is a little confusing, So I will start with a picture...
To make the nut thinner, I made the sides of the nut thinner by grounding them down. This allowed the sides of the nut, that sat on the heater band, to be thinner. Now the thermocoupler has very secure mount and is held tight against the pipe.
Since I change the guts out, and some of the pre-manufactured wires were too short, I also decided to swap the legs (right to left). So my ExtrusionBot will probably look backwards compared to everyone elses... The Auto-Spool winding motor will now end up on the opposite side of the Eventorbot (and as such, need to turn in the opposite direction). Since the Auto-Spool winding motor is DC, to get it to turn in the opposite direction, just means reversing the + and - connections.
I will post some pictures of the changes involved in switching the legs, later.
The thermocoupler mount seemed flimsy. And I wasn't sure how it would hold up to temperature changes. So I reinforced the mount with a band clamp and a 1/4 inch x 20 thread count nut. I drilled a 1/4 inch hole in the band clamp for the thermocoupler to pass through and positioned the nut directly under the hole, and on top of the existing thermocoupler mounting point.
The nut was a little too thick to sit entirely on top of the band clamp, and allow the thermocoupler to reach all the way to the pipe. The full description of what I did to make the nut fit is a little confusing, So I will start with a picture...
To make the nut thinner, I made the sides of the nut thinner by grounding them down. This allowed the sides of the nut, that sat on the heater band, to be thinner. Now the thermocoupler has very secure mount and is held tight against the pipe.
Since I change the guts out, and some of the pre-manufactured wires were too short, I also decided to swap the legs (right to left). So my ExtrusionBot will probably look backwards compared to everyone elses... The Auto-Spool winding motor will now end up on the opposite side of the Eventorbot (and as such, need to turn in the opposite direction). Since the Auto-Spool winding motor is DC, to get it to turn in the opposite direction, just means reversing the + and - connections.
I will post some pictures of the changes involved in switching the legs, later.
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