Need advice on drilling Micro Seiki armboard

[blackswan]

I am going to install a Glanz MH-1200s on a Micro Seiki SX-5000 TT. I bought a blank gunmetal armboard on flea bay and need some help with getting a mounting hole drilled.

1. When measuring the center of the hole to be drilled, does it matter the mounting position of the armboard? For example, if the armboard is at the top right corner of the TT, the armboard can swivel between 9 o'clock to 6 o'clock.
2. What shops should I take it to get a hole drilled? A CNC machine shop?
3. In the PTA review (https://parttimeaudiophile.com/2020/09/27/glanz-mh-124s-premium-tonearm-review/), Richard Mak mentioned a counterbore? Am I right to think that I probably don't need the countersink since my armboard is thinner.

My last TT was a Linn with a Linn tonearm so this is new to me. Appreciate any help/advice.

- Ray

 

[Another Johnson]

The tonearms I have mounted, and/or bored holes in arm boards for, have had templates or at least specs (spindle to pivot distance and overhang). This installation info has typically come from the arm manufacturer.

I suspect that that’s not a cheap arm or TT, so my advice would be to contact both companies for their help.

As for what machine shop to use, if you mark/layout the piece and give them instructions, just about any small shop that does engine upgrades should be able to handle it. It’s not rocket science.

 

[mtemur]

A fixed vertical drill is enough to drill the holes. There is no need for a cnc. I recommend you to check P2S distance beforehand as suggested by @Another Johnson. Also check if tonearm’s collet fits the hole as well as other mounting gear.

 

[rwwear]

I am going to install a Glanz MH-1200s on a Micro Seiki SX-5000 TT. I bought a blank gunmetal armboard on flea bay and need some help with getting a mounting hole drilled.

1. When measuring the center of the hole to be drilled, does it matter the mounting position of the armboard? For example, if the armboard is at the top right corner of the TT, the armboard can swivel between 9 o'clock to 6 o'clock.
2. What shops should I take it to get a hole drilled? A CNC machine shop?
3. In the PTA review (https://parttimeaudiophile.com/2020/09/27/glanz-mh-124s-premium-tonearm-review/), Richard Mak mentioned a counterbore? Am I right to think that I probably don't need the countersink since my armboard is thinner.

My last TT was a Linn with a Linn tonearm so this is new to me. Appreciate any help/advice.

- Ray

I think if you use the template that should come with arm you will be able to correctly ascertain where the armboard can be located for proper geometry at two locations on the record fairly easily. Just make sure the stylus can maintain the proper overhang and tracking angle.