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Screw thread for Isotemp OCXO 134-10 / 12 Brackets
Posted: Wed Feb 18, 2015 7:59 am
by G8DKC
Hi,
Can anyone help with screw thread size for the holding brackets at the bottom of an Isotemp OCXO 134-10 / 12?
Making brackets no problem, but have nothing near that size.
Engineering drawing has only dimensions and spacing's.
73
Peter
Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets
Posted: Wed Feb 18, 2015 4:05 pm
by gm1mfn
The data sheet
here shows the slot width is just over 1/8th inch so a 3mm screw should work fine.
Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets
Posted: Wed Feb 18, 2015 6:43 pm
by G8DKC
Thanks for the reply, I may have explained better...
The problem is I have no idea what sort of screws to go into the side of the OCXO,
you can't really tap them as it is a sealed box and may contaminate the inside.
Probably USA thread, wonder what size would be equivalent to say a an old 8 BA or so.?
73
Peter
Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets
Posted: Wed Feb 18, 2015 8:19 pm
by MN-tech
Hi Peter,
I printed the mechanical drawing and determined the screw head size by referencing the known dimensions.
http://www.isotemp.com/wp-content/uploa ... 134-10.pdf
The screw heads attaching the brackets are about 0.180" dia. The closest US size is a #2 at 0.165.
That screw may not be drawn to scale or could be metric?
The screw covering the adj hole is 0.322" which matches a US #8.
Have you considered just using doubled sided foam tape?
John
Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets
Posted: Thu Feb 19, 2015 7:31 pm
by G8DKC
Hi John,
Thank's for looking and working out the possible sizes.
Did think of tape, but it does get warm in its Box of bits.
I think a local Ham the other side of Leicester has found the answer?
He is bringing over a jar of screws saved from stripping HP equipment.
I will let the you and the forum know.
73
Peter