Primary coil strike rail

I have also decided to fit a strike rail to the primary coil assembly. This, in conjunction with the anti-strike disc, should help prevent stray streamers hitting the primary coil. The strike rail is made from a length of 4mm diameter micro-bore copper tubing. It will be mounted around the perimeter of the anti-strike disc and will form an 86cm diameter ring, hence I bought 3m length of tubing from a seller on eBay (86 X 3.141=270cm). The strike rail will be fitted on the underside of the anti-strike disc and will be supported by 16 mounts evenly spaced. Each mount is a cut from a 20mm diameter clear perspex rod, each one 20mm long. The tops and bottoms of each were polished to a glass like finish. These mounts were made and supplied by the excellent Trent Plastics, a company I highly recommend for all your plastic needs. The finish quality was amazing and the price for 16 of these little beauties was very fair.

Here's one of the mounts, I have already drilled this one ready to accept M4 threads. It will also require a horizontal 5mm hole drilling that will accept the 4mm copper tubing.

The mounts are masked up again for the next drill hole and tapping.

Here's the mounting blocks almost in situ. They will actually be bolted to the underside of the anti-strike disc by M4 12mm bolts, probably nylon but possibly stainless as insulation is not an issue here. There are 16 mounts, 8 of which line up with the 8 primary coil support combs, the other 8 are evenly spaced between these. 8 would have been enough to support the strike rail but 16 looks better.

The 3m length of 4mm micro-bore tubing arrived tightly coiled in an A4 size jiffy bag. It took a little work to slowly open the coils up to the approximate correct diameter.


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