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3D printed SMA torque wrench
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DuWayne Schmidlkofer wanted to see if using a torque wrench could help make his readings a little more consistant.
Looking around he saw that even the cheap SMA torque wrenches are nearly as expensive as the NanoVNA itself. He 3D printed a simple torque wrench, though unclibrated, gives a more repeatable response than just 'finger tight'. Info and plans at https://kv4qb.blogspot.com/2020/02/sma-torque-wrench-for-nanovna.html |
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Reinier Gerritsen
Cheap torque wrenches on Aliexpress. Search for "Mxita sma torque wrench". Around €15-20.
You can have it adjusted to the torque you need. Steel sma connectors need 1 Nm, gold plated brass 0.5 Nm. |
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Hi there, I might buy one just to compare with my 3D printed wrenches. On Sat, 25 Apr 2020 at 18:03, Reinier Gerritsen <r.gerritsen@...> wrote: Cheap torque wrenches on Aliexpress. Search for "Mxita sma torque wrench". Around €15-20. |
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Reinier Gerritsen
When you order, you can ask the seller to adjust it. I order 5 pcs, also for my job. However, the screw setting the required torque was not locked, so the calibration did not hold. I recently ordered a cheap Newton meter (5N range). With a piece of wire at 125 mm from the sma axis, you need a force of 4N to get a 0.5 Nm torque. Easily calibrated yourself.
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Op 25-4-2020 om 23:24 schreef CT2FZI: Hi there, |
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You gave an idea: If you are talking about those cheap spring type Newton meter that we can find at aliexpress, I can print a 125mm SMA wrench and with a simple jig I can apply the calculated 4N, with no need of a specialized torque wrench ...
Just hang the newton meter above and apply the force till 4N. |
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I ordered a "Mxita sma torque wrench" from AliExpress in January and after 10 weeks it had not come, so I gave up on it. Eventually I was able to get a refund. The Tindie V2 page now advises that shipping is taking 60-100 days.
Bob |
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