The drawing for the hexagon heaterblock used on the TAZ 6 is missing dimensions and tolerances.
- Mentioned In
- rTAZOLIVE5cc76a179998: add step file for heater block. T4437.
rTAZOLIVEe97a409b30c9: Add rev letter T4437
rTAZOLIVEddca43fa99ad: Add angle to chamfers T4437
rTAZOLIVE7f18a619aa1f: Loosen tolerance on heater cartride hole T4437
rTAZOLIVE73182aac95ae: Add depth callout to set screw hole T4437
rTAZOLIVE2405a04daebe: Tighten tolerance on heater hole and re-number notes T4437
rTAZOLIVE99f195dab043: Tighten tolerances on critical dimensions T4437
rTAZOLIVEd3c19d614c7d: Create drawing for heater block T4437
- Mentioned Here
- M3: Cura Configuration Wizard restructure
@kent here is some initial feedback on this drawing.
i think in the notes instead of "remove all burrs and shavings", and "no additional finishes or coatings" this should be changed to "break all edges" and "parts must be clean, free of oil and debris" for consistency across all our drawings
This drawing is missing a call out for the location of the thermistor slot. The heater cartridge hole diameter and location is not fully called out. There is no call out for the chamfer just a note that it cannot exceed a 6.4mm diameter on the surface. The 6.4mm hole that gets tapped is called out too large. if they drill to 6.4mm then try and tap it with m6 threads there will be basically no threads. the recommended drill size for an m6 tap is 5.2mm.
@samantha is also looking at this drawing and will likely have more feedback
Some feedback on the chamfer dimension:
I've been rejecting chamfers over 6.64mm, so I think 6.4mm chamfer size limit in the drawing would work well. Specifying it well under 6.64(the highest diameter we know works with the Reprap nozzles) will make inspection much quicker and keep fallout to a minimum. Due to the size variance in Reprap nozzles, 6.4mm as a chamfer diameter limit will hopefully eliminate all nozzle leaks going forward.
Thanks for the quick turnaround on this spec sheet.
Ok, re-numbered and fixed the tolerance on the heater cartridge hole. Only thing I'm a little uneasy about is that we might be over-specifying the hole for the thermistor on the top view because we call out the radius and the position of the edge but I think they might be specifying different things.
@kent this latest change allows the minimum diameter of the heater cartridge hole to be 6mm which is the nominal diameter of the heater cartridge. The heater cartridge will have some tolerance as well, and could be greater than 6mm in diameter. On E3d's drawing for the cartridge they have it called out as 6.00 but there is no tolerance block or reference for ISO so I'm not sure what the tolerance is on those. We will just want to make sure that the largest diameter heaters we get will still fit in the block.
@tutley that's why I put it at four places in the rev before last. I haven't taken a huge sample or done any control chart for it, but based on a hand full of measurements of the heater cartridges, the average is 5.95mm with some as low as 5.9mm and some as high as 6.00mm so I think the +/-.1mm on the 6.1mm dimension should fit the large majority of the heater cartridges.
fwiw, the previous version of this drawing (which I am unable to locate the source for) specs the hole at 6.10 which means holes in the range from 6.85 to 6.35 would be acceptable, even though we know they are not.
@kent the depth callout on the hole should go at the end of the line of the callout it is to be applied to. so, it should come after "thread" here. Since it is at the end of everything it could be interpreted to apply to the chamfer as well. Since the angle of the chamfer is not specified, this would then mean its a very steeply angled chamfer of that depth that comes to the specified diameter. Also, you should probably specify the angle of the chamfers.
ok @jessica the drawing for the hexagon heaterblock can be found here http://devel.lulzbot.com/TAZ/Olive/production_parts/machined_parts/lulzbot_edition_hexagon_hotend-0.5mm/ao-hex_heater-block_revA.pdf
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