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Adding compression to a wood auger

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Anonymous

Adding compression to a wood auger

11/07/2019 at 14:46

Hi,
still in a experimental stage but perfectly doable.

objective : add compression wood auger drill

user profile
: novice, patient. also, understand this as a good exercise to learn welding, grinding and how to use a Dremel

min. required machines
:
– Dremel (50$)
– MIG welder with self shielded wire (~400) ; forget about stick welding this, it’s creating too much slag
– Angle grinder (~40$)

recommended machines 
:
– TIG welder to build up better and faster material (filler rod is cheaper than MIG wire). You can use also stretched spring (is called also ‘music wire’).
– hand belt sander, always recommended for extrusion screw making / rebuild
– bench belt sander, optimal to remove spatter

consumables
– around 50 – 100 $; possibly 20$ in electricity

process
– create a fixture as seen below; surprisingly the screw didn’t bend much at all; keep checking and straighten it out in case; the fixture also acts as rest for the grinding part
– it takes around 1 hour for 3 cm with the min. machines  alone, 30 mins with better tools

open & todo
– can someone try this with a low-budget MIG welder, I am not quite sure there will be too much slag
– find more ways to build material, i guess brazing is out but i will try

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starter
17/07/2019 at 13:23

Guys / Gals. I’ve created a new thread to continue discussions on a DIY extruder screw machine rather than take this one any further off topic.

http://onearmy.world/community/forums/topic/diy-extruder-screw/

I’ve also gathered some supplies and will have a go at putting something together based on the outlined design.

Please feel free to join in / get involved.
/DM

new
30/11/2019 at 08:50

Hi everyone,

This may not be feasible, but why not combine two methods and try this:

1. 3D print the screw with Carbon Fiber filament.
2. Calculate the length required if you were to epoxy a strip of steel to the working edge of the screw.
3. Calculate the taper of the width required to match the screw.
4. Cut said strip of steel with sufficient length and width.
5. Scuff the surface of the steel that will face the screw, finish and polish the working side.
6. Bend the steel around the screw to pre-form and ensure accuracy.
7. Epoxy the steel strip to the screw.
8. Allow to cure.
9. Test and document the results.
10. Report back here with the outcome.

I may have left something out, but you get the general idea.

Best regards,
Rob

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