Pls. recommend me a cheap SMA torque wrench 8mm (5/16") available in Germany... - Page 1
Forum section: electronics / general

author: DC1MC
author_rank: Super Contributor
timestamp: November 22, 2020, 10:03:47 am
content: Hello everybody,I've decided to move my behind and finally attempt to repair my Anritsu signal generator, and I've discovered that it has a lot of SMA connectors and I have no tool for them.Looking for such a wrench in Germany and outside I was truly amazed of the beyond obscene prices, hundreds of euros for things that should cost 10EUR at most, here is an example:https://www.ebay-kleinanzeigen.de/s-anzeige/drehmomentschluessel-fuer-radiall-sma-stecker-r282320000/1385561042-84-9290Does anybody has a source inside DE or at least EU for a 20ish... EUR piece, Aliexpress is full of Mxita, reasonably priced and a huge selection, but of course delivery in January or such and all EBAY sellers are out of stock.Thanks,DC1MC

author: tggzzz
author_rank: Super Contributor
timestamp: November 22, 2020, 10:24:37 am
content: Quote from: DC1MC on November 22, 2020, 10:03:47 amA standard 8mm spanner with a ring at one end, plus a spring balance.My balance is 0-4lb/1.5kg, but that is dependent on the length of the spanner, of course.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 22, 2020, 10:33:49 am
content: Quote from: DC1MC on November 22, 2020, 10:03:47 ammaybe a marker pen with normal wrench would do? mark the sma connectors at any side. when you want to install back, rotate until the marking aligned again. if you want bonus, at the same time, learn muscle memory, ie how much strength needed to rotate them aligned again, so you can do the muscle torque memory later to do other connections. ps: EUR10 is for normal to good quality normal wrench. its normal for EUR100 RF torque wrench, there are more expensive version, now you know. ymmv.

author: DC1MC
author_rank: Super Contributor
timestamp: November 22, 2020, 06:27:06 pm
content: Looking at the position of the connectors something like this may help:https://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/HFgAAOSwenZfnsKC/$_59.JPGDoes anybody knew their name in English or German, or where can they be bought ?EDIT: Of course for 8mm size !!!Thanks,DC1MC

author: DaJMasta
author_rank: Super Contributor
timestamp: November 22, 2020, 09:20:20 pm
content: Torque wrenches tend to be pretty pricey across the board in my experience, but getting a 5/16" one for SMAs used can be more reasonable on ebay and the like. Something like the Huber & Suhner 74 Z-0-0-21 sometimes has some availability on the used market for around double the price you're looking at - $50usd or so.Otherwise even for torque wrenches for other fields, they tend to be quite expensive when new, so you run into the same issue on the used market. Something like the Anritsu 01-201 can come up on the used market and if SMA isn't marked in the title you may be able to get it cheaper (and fewer people will see it). Also worth looking for Wiltron branded wrenches, since they're the same but just from before Anritsu's purchase of them.

author: Gregg
author_rank: Super Contributor
timestamp: November 23, 2020, 02:25:08 am
content: Torque limiting screwdrivers should be readily available on fleabay; these usually slip when the adjustable torque limit is reached. An inexpensive spanner and some silver braze should work to make a crowfoot type wrench suitable for your needs but a little math may be needed to take care of the offset of the open end wrench end and the axis of the screwdriver.

author: tggzzz
author_rank: Super Contributor
timestamp: November 23, 2020, 08:25:11 am
content: Homebrew variant, which should be acceptably accurate for non-professional use. Make sure the two arms are at 90 degrees when pulling, of course!It can also be used as a sanity check for a "proper" tool.

author: tszaboo
author_rank: Super Contributor
timestamp: November 23, 2020, 10:08:10 am
content: If you are willing to investigate and spend some time on it:Megiq ships 3D printed torque wrench with their VNAs. It has a notch and special structure to give way if you try to overtorque it. I'm not sure how accurate it is and if it takes any effort of special plastic to print it though. If you just need something...