CNC Table Flattening — When the Spoilboard Is Lying to You

If the last job was off in one corner and fine in another, stop blaming the file. The table is lying.

A cutter can only be as true as the surface it rides. When the spoilboard or the bed itself is high in one spot and low in another, depth changes across the sheet. You get thin spots, uncut tabs, and edges that don’t match. Flattening is the pass that takes that surface back to true so the next job sits flat.

What flattening actually is

Flattening is a facing pass on the table, the spoilboard, or a slab you need true. A wide cutter skims the high spots until the whole surface is one plane. It is not a new table. It is not a software trick. It is metal or wood coming off until a straightedge and a gauge agree.

We do this as a job. See table flattening. Price is a quote. It depends on size and how far out the surface is. There is no add-to-cart for it.

How you know you need it

You do not need a speech. You need the symptoms:

• One corner of the part is thin. The opposite corner still has tabs.
• A straightedge rocks on the spoilboard.
• Paper or a feeler gauge slides under the bar on one side only.
• The same file cut fine last month and does not now.
• You just changed a spoilboard or moved the machine.

If two of those are true, flatten before the next paid run. Cutting around a bad table wastes stock.

What we need from you

Tell us what is wrong and how big the surface is. A photo of the table and a straightedge on it is enough. If you have a drawing, email it. Do not upload a file on the site. There is no upload form.

Contact is the only path. Text, email, or phone. Describe the table, the machine if you know it, and whether you want us to flatten the spoilboard in place or take a slab.

Do not send a DXF and ask for an instant price. Flattening is not a blank in the shop. Shop SKUs have listed prices. This does not.

What we will not invent

We will not quote a number in an article. We will not promise a day count. We will not tell you to drop a file in a portal. When the job is real, we look at the table and we quote that table.

Ready-made blanks stay in the shop with a price. Flattening, one-off parts, and whole models stay on a conversation.

After it is true

A flat table does not stay flat forever. Spoilboards wear. Shops drop things. If the next job starts drifting again, it is time for another pass, not a new file.

If the table is the problem, say so on contact. If you need a part cut or a whole model built, say that too. Same shop. Same rule: no file dump.