Screw thread for Isotemp OCXO 134-10 / 12 Brackets

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G8DKC
Posts: 269
Joined: Thu Jun 28, 2012 9:39 am

Screw thread for Isotemp OCXO 134-10 / 12 Brackets

Post by G8DKC » Wed Feb 18, 2015 7:59 am

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

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gm1mfn
Posts: 99
Joined: Tue Sep 09, 2008 12:32 pm

Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets

Post by gm1mfn » Wed Feb 18, 2015 4:05 pm

The data sheet here shows the slot width is just over 1/8th inch so a 3mm screw should work fine.
Doppler effect: The tendency of stupid ideas to seem smarter when they come at you rapidly.

G8DKC
Posts: 269
Joined: Thu Jun 28, 2012 9:39 am

Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets

Post by G8DKC » Wed Feb 18, 2015 6:43 pm

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

MN-tech
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Joined: Thu Aug 30, 2012 6:01 pm

Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets

Post by MN-tech » Wed Feb 18, 2015 8:19 pm

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

G8DKC
Posts: 269
Joined: Thu Jun 28, 2012 9:39 am

Re: Screw thread for Isotemp OCXO 134-10 / 12 Brackets

Post by G8DKC » Thu Feb 19, 2015 7:31 pm

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

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