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  #21  
Old 13-12-2019, 05:26 AM
Wilso (Darren)
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We usually would only do a 4mm and then go straight to the 10mm drill bit so your using most of the cutting surface. Go slow with lube and pressure and if the bits are sharp should cut very easily.
Lucky you weren’t drilling stainless
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  #22  
Old 13-12-2019, 06:04 AM
AstroApprentice (Jason)
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Drill press?

Do you have access to a pedestal drill press? The right drill speed for bit size and the use of cutting fluid is important as you need a nice neat, straight hole so there’s no/minimal slop around thread - even more important if you’re planning to tap a thread...
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  #23  
Old 13-12-2019, 08:54 AM
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doppler (Rick)
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A quick solution is to make a spacer out of timber. My top plate is a bolt down base for an outdoor umbrella so already had threaded holes. Anker screw bolts can be easily reused, I have taken my pier down a couple of times to repaint etc. and reused the same bolts.
Rick
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  #24  
Old 13-12-2019, 07:49 PM
Hemi
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thanks again everyone,

ive decided to unbolt the pier and take it back to the fabricator. Ill get the 65mm recess deepened and flattened and the azimuth pin hole drilled. I might get a plate welded to reduce the 32 mm recess to end in a central m12 hole, to make mount bolting easier and more secure.

Cheers

one and all

Hemi
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