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7 votes
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What's the best way to design a joint with two fasteners?

I think you might have a misconception regarding to how far the pressure from the fasteners extends. One subject you might want to have a look into is "bolt joint stiffness". The most ...
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6 votes

Mounting and Coupling an Encoder

That model of encoder is not intended for mechanical measurements. It's meant to be used as a fancy knob with high friction, for turning by hand, say, to pick a position from menu on a display, and ...
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4 votes
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Mounting and Coupling an Encoder

The flat on the encoder shaft would typically be used for set screw. If you are able to get a gear or wheel with the right size shaft then adding a screw should be relatively straightforward. This ...
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3 votes
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How does a union joint with two male threads work?

Typically, most threads on pipes (in the USA at least) are male NPT and all the couplings or fittings are female NPT. You can connect two pipes with a coupling as long as the last pipe added is free ...
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  • 7,469
3 votes

How to calculate properties of a thread?

Well I would suggest that you don’t thread one of the items - just have a clearance hole then a locking nut. Then, to get a precise position have a hole with a locating pin - this will ensure the ...
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3 votes

Bonding Semiconductors to PCB

A few things, hopefully helpful: Differential thermal contraction is almost certainly your enemy. For most engineering materials, the vast majority of thermal contraction occurs between 300 and 77 K,...
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  • 126
3 votes

Affixing a thermocouple to a surface

A little late to the game. A method recommended in B&W's Steam, Its Generation and Use, is to drill small, closely set holes in the metal substrate, insert the individual wires into the holes, ...
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2 votes

Affixing a thermocouple to a surface

For an easily removable option you can use Kapton tape. It is heat resistant and works well for holding a thermocouple temporarily in place. I also wrap the wires in Kapton for electrical isolation.
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2 votes

Affixing a thermocouple to a surface

I ended up finding a solution that works (haven't tried the cements suggested by others yet). The trick was to use a spot welder rather than a tig welder. With the correct power settings, that stuck ...
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2 votes

What type is miter joint - Welding

Assuming you're talking about plates: it would depend on you code, but usually it's the angle between the two joints that matters. If you mean a 90 degree joint with two 45 degree miter angles, I ...
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  • 4,501
2 votes

Mounting and Coupling an Encoder

Another alternate solution would be to use a Hall Effect sensor. There are many ways to apply a hall effect sensor to measure distance. Most simple might be to attach the hall effect sensor to the ...
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2 votes

Aluminum rivet used to join stainless steel and aluminum sheet

It depends on the rivet's toughness and the thickness of the sheets. Either the stainless steel will cut the rivet, or the rivet will cut a slot in the aluminium. The use of rivet or any other fastner ...
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2 votes
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Fastening rotating surfaces

Long story short : In any moving part you need to use a bearing, however there are many, many types of bearings. The main two types are : https://en.wikipedia.org/wiki/Plain_bearing https://en....
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1 vote
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Locking joints and frame construction

Look at the scaffolding clamps - both fixed and pin- jointed.
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1 vote
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Overcoming limitations of a snap in joint

I would use a collar lock with a slide action locking gate. Solves the durability issues and can be used thousands of times. The collar can be square and slide into a dual keyway to support the blue ...
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1 vote

Achieve mechanically water tight snap-in-place joint

My advice is to change the design if possible from vertical split to horizontal. i.e. horizontal vertical Better Not so good The reason is that : in the vertical solution the internal pressure ...
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1 vote

Achieve mechanically water tight snap-in-place joint

For a static joint, there are basically three options: Use an adhesive of some sort to overcome irregularities in the mating surfaces. Use a gasket to overcome irregularities in the mating surfaces. ...
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1 vote
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How to add a gap when splitting for joint in Solidworks

Use a thin cut extrude, instead of the "Split" tool. Set this to be midplane, and add the total tolerance gap that you require depending on your printer, and how loose you want the puzzle ...
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1 vote

What type is miter joint - Welding

I would agree with your assumption on the weld types. That being said, you could probably just specify a V-groove weld all the way around the joint like this(where xx is the size of the weld) If ...
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  • 1,578
1 vote

What is a good method of creating a pivot point between flat metal bars?

Use a 1/4" dia x 3/16" long shoulder screw with 1/16" thick washer. Also use nut and washer on the thread. You can get the screw at: http://www.mcmaster.com/#90298a530/=10jcicb A steel shoulder screw ...
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1 vote

Affixing a thermocouple to a surface

I read all the comments regarding affixing a thermocouple to a surface. Every one has nice contribution. I have done testing myself to attach temporarily j type thermocouples wire to surfaces and ...
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1 vote

Affixing a thermocouple to a surface

Drill small hole in the aluminum, big enuf to put in the TC junction head, then pound the edge of the hole with a center punch, that'll deform the hole to hold the TC in the hole mechanically. Works ...
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1 vote

Affixing a thermocouple to a surface

I would use a thermal epoxy (potting agent) for this. I have done this successfully with a thermistor before. Also I'm not sure, but you probably want to electrically isolate the thermocouple so that ...
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  • 5,930
1 vote

Affixing a thermocouple to a surface

If you aren't too worried about response speed, you might be able to embed the thermocouple in a thermal grease, then weld a piece of shim steel over the top to provide mechanical support. I have ...
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  • 127
1 vote

Bonding Semiconductors to PCB

I'd agree that you're looking for an epoxy that stays relatively flexible upon curing, especially if the thermal expansion rates of the epoxy and substrates are different. If you haven't already ...
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  • 206
1 vote

Bonding Semiconductors to PCB

I think for that I'd probably try using MasterBond EP21TCHT-1 for what your looking for, It has excellent performance on difficult to bond materials and is also excellent at cryogenic temperatures ...
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