Member postings for AStroud

Hi William

I have a BCA Mk 111 and have just removed the spring , these are the measurements

L = 2.75 ins

OD = 1.03 ins

wire dia = 0.103 ins

Pic:

Hope this helps, Andrew

Edited By Andrew Stroud on 21/10/2018 12:34:54

Hi Robert

I suggest you download a seal manufacturer's design guide where you will find advice on the design of housings for seals, including grooves for O rings. I have a guide from James Walker , would not be without it.

Andrew

Thanks for all the comments, some good advice, I hadn't thought about looking in Machinery's, I see there is a lot there.

I am applying pressure above and below the stock, my knurling tool does have a graduated adjusting screw so I can set the depth cut, but I think doing by feel and inspection is probably the best way. I will raid the scrap box and start practicing.

I would like general advice please on how to knurl, having just purchased a caliper type tool with a diamond pattern for my S7. I understand the need to use slow speed and coolant but what I am not sure about is the number of passes to make.

One book talks about not cutting too deeply at the first pass and use a 10 thou cut, but if you want to make a deeper knurl am I correct in thinking the tool must be kept in contact with the work and not wound clear before increasing the cut ? Otherwise I cannot see how the tool engages exactly with the cut made in the first pass. Is it advisable to knurl with only 1 pass all the time ?