Screw type for Parkinson's 6F engineering vice?

[benjaminmiguras]

Hi forgive me if this is in the wrong section but I have a quick question to those with much more experience than myself.

I have a large Parkinson's 6f engineering vice with quick release and it is missing a bolt at the front. I will post a picture up for idea of scale but this missing bolt stops the quick release from working

Any idea what type of bolt I should look for?

Thanks

Ben

 

[EddyCurrent]

There are quite a few Parkinson F vice restoration projects on YouTube, if you don't get a better answer here maybe one those videos might help.

 

[sploo]

I'm in the process of restoring an 8F so could check the parts on mine. Are you meaning the component that looks like a castle nut? Or maybe the quick release lever?

 

[dannyr]

nice vice/vise -- worth getting it going again -- Parkinson invented this type of buttress thread quick release, copied a few years later by Record, Woden, Fortis and others - many parts are interchangeable but not all, and the no 8 means it's a big 'un. oh, sorry just seen yours is a no6 - still a fine lump of cast iron

I rescued my old Parky with a spring and nut from a cracked Record of about 100 years later - seemed identical, but I may have been lucky.

 

[Alpha-Dave]

I currently have a Parkinson number 7 in pieces as per this thread: Turning Garden Ornaments in to Working Tools

There are 3x screws in the QR mechanism: one on the underside, two in the front to hold the plate on. Is the 6 the same?
I can measure the diameter and TPI this afternoon.

 

[Alpha-Dave]

On my 7-F, there are 2 countersunk screws that hold the front plate on, they are 1/4” 20 tpi. The two I have are 22.2 and 23.5 mm long threaded length.

I ran a Whitworth tap in of that size with no issues.

There are 2x more screws that hold the quick release handle to the slide, and hold the slide-guide to the casting.
The one that holds the slide and handle together is countersunk, 4.4 mm diameter (possibly 3/16” as that is 4.7 mm), 10.4 mm threaded length.
The one that holds the slide-guide to the casting is 20 tpi 1/4” again, dome head, with 13.3 mm threaded section.