Surfacing spoilboard

Now that I have built my spoilboard and mounted to my base board. Do I surface it and then tram it?

Definitely.
First make sure you’ll be able to reach the left/right/front/back limits of your spoilboard with your surfacing bit, by jogging manually to those limits.
Your surfacing op should cover the whole top surface of the spoilboard or your will end up with a recessed pocket.
Once that’s done, tramming your router is a good idea. There are various ways to do that floating around on the forum, here’s a simple one if you have a dial indicator:

Similar idea without the dial indicator in Winston’s video here:

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I’m sure I can reach all the points you mentioned, but will double check when my bit arrives.

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Many call tram leveling the spoil board. Tramming is leveling the router mount to the bas or spoil board. You can use 123 set up blocks or dial indicators or a few other ways. After you get the router/router mount basically level to the base/ spoilboard you can level the spoilboard. Usually you use a 1 inch or larger bit to level. After you level you check for ridges and fine tune the tram and level once again. The spoil board/base may not be level in all corners and the fly cutter makes the router mount/ router and base/ spoil board be in the same plane. They are not necessarily level but coplanar.

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