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Thread: 4th Arm holder for electronics
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18th June 2016, 03:43 PM #1.
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4th Arm holder for electronics
Visiting my son this morning for the usual visit about 3d printing and electronics and I saw him using one of these.
IMG_1554.jpg
I've seen these before but never seen one of the arms being used to funnel/position solder to where it was needed.
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18th June 2016 03:43 PM # ADSGoogle Adsense Advertisement
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18th June 2016, 04:01 PM #2
Never seen those before, look much better than those horrible third hand holders from Altronics etc.
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18th June 2016, 05:37 PM #3GOLD MEMBER
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These are the hoses used for coolant on lathes etc. A bit of searching and you should be able to find a source of the hose only without the little valve on the end. Also very handy for directing an airflow from a compressor onto a scroll saw etc. to clear the dust away (directed towards the dust extractor!)
Alan...
Screen shot 2016-06-18 at 4.32.45 PM.png
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18th June 2016, 06:09 PM #4.
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Yes I already have one of these on my MW lathe but I got mine on eBay where a half dozen of those hoses cost half the price of a single one at H&F
6 PCS 1 4" Round Nozzle Plastic Flexible Water OIL Coolant Pipe Hose 30cm Switch | eBay
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19th June 2016, 11:27 PM #5
Thanks for the info. Little hoses are on order.
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10th July 2016, 03:53 PM #6.
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I got my little hoses on Friday and managed to knock this up the morning.
It also gives me somewhere to locate my old "helping hands" gizmo, which I still find useful.
HelpHands2.jpg
6mm Al plate with edges rounded over using a router.
The red squirty ends of the hoses take a 4mm tap and the alligator clips have 4mm threaded pieces soldered onto them.
Using only first 1/3rd of a starting tap on the quirky end means there is enough friction between the threads for the alligator clips to be rotated so they stay in position although a locking wingnut could also be used if needed.
The other end of the hoses have a plastic 1/2" UNF thread but the plastic mould lines are quite prominent and prevent them screwing into the al plate even under some force.
I ran a 1/2" UNF die over the thread but it grabbed too easily and I managed to cross thread the die on the feisty one then I remembered the trick of using light machine oil as a lube and the die went on dead easy.
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17th July 2016, 08:49 AM #7
I backed https://www.kickstarter.com/projects...ile-third-hand on Kickstarter, also now available from Hobby Creek
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17th July 2016, 11:53 AM #8.
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I have since found out there is an "Instructable" web page Third Hand++: A multi-use helping hand for electronics and other delicate work. with 348k views and a 9 year history on building these things.
If these interest you it's worth having a look through the photos in the Instructable comments because other persons have come up with many different variations and uses.
Since making mine I have found out that the thread on the base of the coolant nozzle hoses is 1/4" BSP (19 TPI, 0D 13.16mm) while I thought they were 1/2" UNF (20 TPI, OD 12.7mm) which is probably why I had trouble getting the threads in to begin with. Although I have both sizes of taps and dies, if all you have are the UNF taps and dies then running a 1/2" UNF over the plastic thread with a drop of machine oil will easily re-size the thread.
Of course it's not necessary to use Al for the base, wood would work and the coolant nozzles could be just screwed into a tight fitting hole.
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