Planer thickness

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Forum topic by unisaw posted 03-09-2013 07:47 PM 983 views 0 times favorited 6 replies Add to Favorites Watch
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92 posts in 4330 days

03-09-2013 07:47 PM

I Have a delta 12 1/2 planer and need to plane two 12” red oak boards that I just resaw(ed) to 9/16”. I need to plane to 7/16”. I’ve never used the planer for anything less that 1/2”. Is there a minimum thickness for this planer? Nothing in the manual.


6 replies so far

View Ripthorn's profile


1458 posts in 3182 days

#1 posted 03-09-2013 08:18 PM

Most planers have a minimum thickness of 1/8”. You should be fine, but if you go too thin or with difficult woods, running it through on a backer board will help prevent potential destruction of the board.

-- Brian T. - Exact science is not an exact science

View Dallas's profile


3599 posts in 2684 days

#2 posted 03-09-2013 08:20 PM

I’m not sure what model Delta you have but my 22-580 will go down to 1/8” easily.

If I want thinner than that I use double stick tape to make the piece thicker.

Look for your plane manual online if you don’t have it….. it should be free somewhere.

I haven’t paid for a manual in years. If I don’t have one with the tool I WILL get one.

-- Improvise.... Adapt...... Overcome!

View PaulJerome's profile


57 posts in 3230 days

#3 posted 03-09-2013 08:23 PM

Typically on a lunchbox planer it’s about a 1/4”, however, what i do is use a planer sled. Simply use a nice flat piece of MDF that extends to the length of your infeed and outfeed tables. Put cleats on both ends to secure in place. Simply set the sled in your planer and run your stock as ususal. Works well! Hope this helps.

-- Paul, Central Illinois

View unisaw's profile


92 posts in 4330 days

#4 posted 03-09-2013 08:35 PM

Great feedback. Time for a sled.

View runswithscissors's profile


2892 posts in 2222 days

#5 posted 03-10-2013 01:38 AM

A reason for having a minimum thickness is that, as they encounter the leading end of the board, the knives tend to lift the wood (one of the reasons, amongst others, for snipe). If the wood is too thin, it can lift and shatter. The feed rollers can’t prevent this because the space between the infeed roller and knives is great enough to allow flexing.

7/16” certainly shouldn’t give you any problems.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View GT350's profile


370 posts in 2179 days

#6 posted 03-10-2013 02:16 AM

I have a delta 12” and I think it stops at about 1/4”, I have a baseboard so I can go thinner but I have on occasion gotten little pieces flying out at me though. Your 7/16 should be no problem at all.

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