There just might be a reason you do not see this happen. Or tool companies making such equipment. Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

Might work for one shallow mortise. In pine. Maybe 1/8" deep. How much do you weigh? If over 250 lbs, you might be able to go another 1/8". There just might be a reason you do not see this happen. Or tool companies making such equipment. Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

Then there is a pencil. One will be needed along with a square to draw a line where you want your square hole to be. Get ready, you have a really, really, rough road ahead of you.

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The pressure required to push a square chisel into the wood is so great that I would expect it would push a light duty attachment out of square to the work. But I could be wrong. However, I would offer that a plunge router either with an edge guide, or template using a bushing would be quicker and more accurate. Squaring the corners is an easy task by comparison. Makita does make a 18v router and plunge base, so staying with the same brand would give you an extra battery.

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If over 250 lbs, you might be able to go another 1/8". There just might be a reason you do not see this happen. Or tool companies making such equipment. Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

How much do you weigh? If over 250 lbs, you might be able to go another 1/8". There just might be a reason you do not see this happen. Or tool companies making such equipment. Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

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+1 with Rich You could also get a square chisel mortising bit for a drill press and fit a handle on it to hammer on There are limitations to battery powered tools...........

Simple improvements make a mortising attachment work great. Even though they're sexy, benchtop mortising machines aren't the only power-tool option when it comes to cutting square-shouldered mortises. A drill-press mortising attachment can be just as effective and it costs a lot less.

Any professional would/should know about the bench mortising machines. Some can be had for less money than a cordless drill. Even if you are unaware of the benchtop mortising machines, you should know about a chisel. And using a chisel for squaring a round hole? So basic as to be unmentioned. But then a chisel needs to be sharp, meaning a series of whetstones, or powered sharpening equipment. More stuff to buy. Then there is a pencil. One will be needed along with a square to draw a line where you want your square hole to be. Get ready, you have a really, really, rough road ahead of you.

Or if you just have a couple square mortises to cut you could drill them first and then follow up with a sacrificial drill press mortise chisel and a hammer. BH Davis

The better Makita 18v drills with aluminium body’s put out a ridiculous amount of torque. You can hurt yourself when they fetch up. Answer is no.

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We all know how hard you have to push on a bench chisel to enlarge a mortise. The better Makita 18v drills with aluminium body’s put out a ridiculous amount of torque. You can hurt yourself when they fetch up. Answer is no.

Wellll, I once worked for a contractor who insisted that I square mortise all the balusters into the stair treads in a house I was trimming in. I spent a lot of time at a table saw cutting the stub tenons on site and a lot of time on the stairs squaring holes. Could be a reason.....

Perhaps a portable chain mortiser might do what you need. See link below. Or if you just have a couple square mortises to cut you could drill them first and then follow up with a sacrificial drill press mortise chisel and a hammer. BH Davis

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The forum requires you answer affirmatively, but your question belies your position. Any professional would/should know about the bench mortising machines. Some can be had for less money than a cordless drill. Even if you are unaware of the benchtop mortising machines, you should know about a chisel. And using a chisel for squaring a round hole? So basic as to be unmentioned. But then a chisel needs to be sharp, meaning a series of whetstones, or powered sharpening equipment. More stuff to buy. Then there is a pencil. One will be needed along with a square to draw a line where you want your square hole to be. Get ready, you have a really, really, rough road ahead of you.

However, I would offer that a plunge router either with an edge guide, or template using a bushing would be quicker and more accurate. Squaring the corners is an easy task by comparison. Makita does make a 18v router and plunge base, so staying with the same brand would give you an extra battery.

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My intention is not to offend, but you are a professional woodworker? The forum requires you answer affirmatively, but your question belies your position. Any professional would/should know about the bench mortising machines. Some can be had for less money than a cordless drill. Even if you are unaware of the benchtop mortising machines, you should know about a chisel. And using a chisel for squaring a round hole? So basic as to be unmentioned. But then a chisel needs to be sharp, meaning a series of whetstones, or powered sharpening equipment. More stuff to buy. Then there is a pencil. One will be needed along with a square to draw a line where you want your square hole to be. Get ready, you have a really, really, rough road ahead of you.

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The drill is not the limiting factor. I’m assuming that you have never used a proper mortising machine(long handle or long reach foot peddle) or one of those drill press rigs (where you wish the handle was a foot longer). The force required to push a sharp high quality(Japan/Taiwan) square chisel into anything beyond pine is very high. We all know how hard you have to push on a bench chisel to enlarge a mortise. The better Makita 18v drills with aluminium body’s put out a ridiculous amount of torque. You can hurt yourself when they fetch up. Answer is no.

The force required to push a sharp high quality(Japan/Taiwan) square chisel into anything beyond pine is very high. We all know how hard you have to push on a bench chisel to enlarge a mortise. The better Makita 18v drills with aluminium body’s put out a ridiculous amount of torque. You can hurt yourself when they fetch up. Answer is no.

Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

A lot of knowledgeable folks have chimed in here to help you out. It would be nice to hear back from you with your thoughts on the responses plus perhaps a little more detail on your project. Thanks, BH Davis

Even if you are unaware of the benchtop mortising machines, you should know about a chisel. And using a chisel for squaring a round hole? So basic as to be unmentioned. But then a chisel needs to be sharp, meaning a series of whetstones, or powered sharpening equipment. More stuff to buy. Then there is a pencil. One will be needed along with a square to draw a line where you want your square hole to be. Get ready, you have a really, really, rough road ahead of you.

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You might as well just chop in the mortise with a mortising chisel and mallet. It was done that way for centuries before power tools.

Maybe 1/8" deep. How much do you weigh? If over 250 lbs, you might be able to go another 1/8". There just might be a reason you do not see this happen. Or tool companies making such equipment. Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

In pine. Maybe 1/8" deep. How much do you weigh? If over 250 lbs, you might be able to go another 1/8". There just might be a reason you do not see this happen. Or tool companies making such equipment. Tool companies do make portable bench top mortisers capable of occasional light work. There is no reason to believe those things won't do the job.

Scott, A lot of knowledgeable folks have chimed in here to help you out. It would be nice to hear back from you with your thoughts on the responses plus perhaps a little more detail on your project. Thanks, BH Davis

Has anyone successfully used a cordless drill (I have Makita 18V) and a portable benchtop drill stand/press with a square mortising attachment? I would like something PORTABLE and cordless for doing square mortises in the field.