I am pulling my hair out - trying to find some components for a jig I am designing and am having trouble finding it – no company i have contacted by phone today has what I am looking for - so I will describe what I am looking for and maybe someone can give me some advice as to who I can call to buy it – or at least tell me what to call it -what the mechanism is commonly known as.
Anyone know what a drafting compass is? With the thumb wheel in the middle which when turning spreads the legs of the compass apart?
That is what I am looking for- a threaded rod, with both left and right hand threads, a thumb wheel in the middle and cross dowels, or dowel nuts or trunnion nuts on the end.
I am trying to put together a version larger than a compass though – either 8 or 10 Gage screws – I could settle for ¼ inch but that is a bit large for me – and hopefully a precision screw like maybe 80 or 60 threads per inch if possible (would accept as low as 32 tpi if I have to though). I have called all the adjustment screw specialists i could find.
All I need, are those three parts – the middle thumb wheel, the threaded rod – technically known as “equal thread length rods – right and left hand threaded”, and the cross dowels, or dowel nuts or trunnion nuts to go on the end.
I can find equal thread length rod but only in 1/4 20 at Mc masters, and I can find cross dowels in same but I am looking for something more precision...
I am trying to build a jig, and on this jig, I need to spread two aluminium plates apart and provide between 10 to 45 degree angle between the two plates - is there a better way to do this with low cost (I am talking about under 25 bucks) manual components?
Anyone have any suggestions where I can find this?