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Makita 2012nb

Status: Down. Clogged with sawdust. in a not good way. [crafty @ 1/18/19 14:13]

Asset: AMT083

Donated by Zen Toolworks


  • Certified users only*
  • Eye protection required
  • Must use dust collector – confirm there is room in the dust collector bin before planing; this tool and the jointer turn a small amount of wood into a huge fluffy pile of shavings
  • No stock under 10"
  • One piece at a time
  • No edge planing without proper setup (please see steward first; use table saw if possible
  • No loose knots or inclusions
  • Report any issues: malfunction, lines left in surface, excessively loud running (it's not that loud with sharp knives), excessive tearout, etc.


    • No MDF, no plywood, no OSB, no plastic, no metal
    • All reclaimed wood or wood from any source other than a commercial lumber yard or mill, home store, etc. MUST be scanned with the metal detector prior to use
    • We have had a number of near-injuries, many hours of steward time, large costs and well over two months of tool downtime from nail strikes and cutting the wrong material


Technical Information Sheet (maintenance and repair, detailed specifications)


  • Please check Meetup or ask on Slack about upcoming classes. Those already experienced with planers can usually get certified by talking to one of the trainers; just ask on Slack or contact a Steward.

* A Note About Certification Requirements:

Certain tools at AMT require certification to use. In general, these are tools that are more likely to injure you out be damaged by misuse. In the shop, the planer, jointer, table saw and band saw currently require certification. Lack of certification requirements does not imply a tool is safe to use without training—the lathe and router table, for example, can do a great deal of damage if misused but we do not yet have training developed. Individual help is available for those tools upon request.

Certification does not necessarily provide all information needed to use the tool in all manners consistent with its intended use, nor does it replace or reduce the obligation of the user to independently read the manual and to understand and use the tool safely.

Some tools have associated risks that may not be obvious. If you are ever unsure about something, please ask—there are many members, including the shop stewards, who are more than happy to help you.


AMT Certification Course

This is a summary of what is taught in the AMT certification course for the Thickness Planer.

What Does a Thickness Planer Do?

This tool can reduce the thickness of stock and leave a furniture-quality face behind that is parallel to the opposite face.

Typically one face is made flat using a jointer, and then the second face is made flat and parallel to the first with the thickness planer.

Thickness Planer Adjustments

You can adjust how much wood is removed by setting the cutting depth. The cutting depth is adjusted by lowering or raising the head. There is a handle for screwing the head up or down and a scale to indicate the approximate depth. The scale may not be accurate.

You adjust the depth so that the resulting stock is the right thickness, but you must not attempt to take off too much wood in one pass. Multiple passes may be required to remove enough wood for your needs.

Thickness Planer Accessories

The most common accessories are support tables, to support the work before it enters the tool and after it leaves, and push sticks of various shapes.

Common Techniques

A thickness planer is used to reduce the thickness of wood and make one face parallel to the other. That's basically all it can do; however, there is still technique to master with a thickness planer: how much wood to remove in each pass, and how many passes to make.

Passes that remove little material end up far smoother than passes that remove a lot. The thickness planer is designed not to allow too much to be removed in one pass, but you should not get close to this limit.

Some woods plane easier than others - very hard woods require more passes to remove the same amount of softer woods.

Unlike the other tools in the shop, the thickness planer draws the wood into the cutter on its own. You only need to keep the wood feeding in straight.

  • Begin by ensuring one flat face using a jointer
  • If the stock is over twice the length of the input table, you may need an input and output support table or roller
  • Set the stock on the input table near the mouth of the thickness planer and set the desired depth of cut
  • Turn on the dust collector
  • Turn on the thickness planer
  • Slowly feed the stock into the thickness planer until it begins to feed the stock on its own
  • Keep the stock going straight into the thickness planer
If the stock stalls because of a low point, just push the stock gently
until the thickness planer resumes feeding on its own.
  • As the stock finishes its pass through the thickness planer, be careful not to let it droop or sag; this leads to tearout at the end of the board

Dust Collection

Planers make a lot of sawdust. The planer has a port near the cutting head for connecting the dust collector hose. Pull out the slider on the hose to allow the collector to suck in sawdust. Turn on the dust collector if it is not already on.

Thickness Planer Safety

A planer's job is similar to a jointer's, but a planer is a safer tool in general. It has its own automatic feed mechanism for drawing the stock through the tool, so once you slide your work into it and the cut begins, you are only “steering” the wood, not pushing it.

Sometimes the automatic feed will stop pulling the wood in and you’ll need to push the stock a little to re-engage the feed wheels. If you push too hard you can damage the tool.

While not as common as with a jointer, kickback can happen on a planer, especially when beginning a cut. Always stand to the side of the work when using a planer. Never attempt to plane short stock. Your work should be more than 3x as long as the gap between the inlet and outlet tables. Use support tables if the stock is over twice the length of the input table.

The main risk of damage is to the thickness planer's blades, which can be nicked by even a tiny fleck of metal in the stock. Once even one blade has a nick in it, the planer will leave a raised line on every face it makes until the blades are re-sharpened and re-aligned.

Thickness planers are very loud. You will have to wear hearing and eye protection when you use one.


Safety Features

This tool has a concealed cutting head to reduce the risk of injury. With stock under 3/4" you might not even be able to reach the cutting blades if you tried (please don't try). However, when planing 10" beams, reaching the blades would be easy.

Planers are designed to discourage you from taking off too much wood in one pass. When you adjust the depth of cut, you are also setting the height of a guard that prevents you from inserting your stock if the cut would remove too much material.

Failsafe Hand Positioning

Failsafe hand positioning means putting your hands where they would not be injured should the unexpected occur.

Place one hand on either side of the stock, sliding it into the planer until it engages, and then steer it so it continues to move straight through.

Failsafe Stock Handling

Failsafe stock handling is how you hold and move your work (aka stock) throughout the entire process.

Never work short stock. Always insert work straight into the planer. If your stock is narrower than the planer throat, choose a random location to feed in your stock and keep it straight as it proceeds. Do not attempt to take off too much in one pass. Never work used materials unless you have checked them thoroughly for metal (nails, screws, tacks, etc) with the metal detector. Let the planer pull the stock; do not try to force it. If your stock isn’t already flat it might have a “valley” where the planer stops dragging the stock forward. If this happens, gently push or pull the work while keeping your hands far from the planer throat. Never push under the machine with your hand.

Default Configuration

When you are done with the Thickness Planer:

  • Unplug the machine and wait for it to come to a halt
  • Remove your work and remove any remaining sawdust with the dust collector hose (or shop vac)
  • Close the dust collector inlet and turn off the collector unless someone else is using it
  • Return the thickness planer to its storage location under the workbench

Protecting the Thickness Planer

The main risk with this tool is damaging the blades. There are typically three of them, and it costs about $100 to have them sharpened. If even a tiny piece of metal touches one of the blades, it will nick the blade, and from then on the thickness planer will produce a face with a wooden line where the nick happened. This puts the planer out of commission until the blades are sharpened to remove the nick.

Only run pure wood on the thickness planer. Don't use it for MDF, particle board, plywood, OSB or Trex.

If the wood is not from a lumber yard, it must be thoroughly checked for metal using the metal detector in the shop.


If a board is 4" wide and 24" long, its face is 96 square inches
Input support table
a table or roller that supports the stock before it contacts the jointer
Input table
the table in front of the cutting head
Output table
the table behind the cutting head
Output support table
a table or roller that supports the stock after it has exited the jointer
the piece of wood to be made thinner

Testing out for certifictation

Experienced users may test out to obtain certifiction. Post on Slack to get in touch with a certfication tester. 

Planer Rubric


Here is a video I found on youtube. I am posting it to give it a look. [1]