How do you teach foundational techniques when the beginner jumps to complex projects?

I've always been on the side of slow and steady gains before you worry about the big finished pieces. Consistency in your striking is the most important thing, even more so than the design itself. If he doesn't develop a feel for the metal reacting predictably to your hammer, then a complex piece like that chest plate is just going to become an expensive pile of slag. I started out with 1/4 inch mild steel and spent months just focusing on shaping square stock into uniform rectangles. This allowed me to relly zero in on controlling the heat and maintaining consistent blow pressure.

When you are working with smaller, manageable sections, you learn how much force you need to achieve a specific taper or a clean bevel. It builds that crucial muscle memory. Jumping straight to the collar slits and the deep shaping of a large piece often means the student is too busy trying to make the shape that they forget to control the heat input. Mastering basic planar work first ensures he actually knows how to properly draw out or taper the steel without burning it through. Patience with the fundamentals saves hours of frustration later, trusting the process of small repeatable tasks.

I totally hear the push for the basics, and hammering out thousands of consistent square bar strikes is a rite of passage. However, I think that approach risks boring the kid or, worse, building muscle memory for repetitive motions that don't apply to the actual job. When I was first learning to work the hammer, I wasn't told to just hit 100 pieces of steel the same way. I was handed a complicated pattern, maybe a piece for a gate or a latch, and told to figure out how to get those specific curves and joints using the tools and the material in my hands.

We worked on a set of small, complex hinges, maybe two or three inches long, for months. The goal wasn't perfect symmetry right out of the box. It was about getting him to understand how the flow of heat changed the metal's behavior when trying to force a shape, how to manage the stress near a joint, and how to adjust his blow based on the piece's thickness. Learning to make a clean hinge is a much bigger intellectual leap than just striking a block of steel until it looks flat.

I found that by the time he finished that set of hinges, he intuitively grasped the principles of heat retention and structural integrity far quicker than if he'd spent weeks just practicing uniform blows on a flat bar. Let him try to hammer out a finished piece of armor from a sketch. The struggle of making the vision real is what teaches him the most about the craft, not just the rhythm of the hammer.

My take after teaching a couple of kids in my shop is that the drill-versus-project debate is a false choice, because you can make the fundamentals the project. Have him forge a second, smaller breastplate section purely as a practice blank before touching the good one, and suddenly those flat, consistent blows on square bar have a purpose he can see. One pedantic point I'd add is that heat-treated stock is a strange material to learn planishing on anyway, since it moves differently under the hammer than mild steel does, so his practice piece should be mild stock even if the finished one isn't. Does he have a scrap bin he's allowed to ruin?

What unlocked it for my nephew was a short cross peen hammer. He could barely swing my full-size rig without tiring halfway through a heat, and tired hands meant wandering blows no matter how much bar we drilled on. Once I put a lighter hammer in his hand, his tapers cleaned up in a week. So my vote is let him chase the armor, but size the tools to him first and keep the practice stock beside it. Kids learn faster when the work doesn't fight them. How tall is he? That changes what hammer weight you want him on.

The poster who said to make the fundamentals the project nailed it, that's how it worked in my shop too. My granddaughter wanted to forge a leaf hook right off the bat, so I had her draw out ten stock nails first, but each nail became a leg for a trivet she actually uses now. No wasted bar, and she coud see the progression. With your boy, maybe those square bar drills become rivets or edge bar for the next armor section, so every heat feeds the real piece he's dreaming about.

Back when I came up, the old man I apprenticed under never had me drill anything. I worked the bellows and held tongs for a month before he even let me swing a hammer, and by the time I did, my eyes had allready learned where the metal moved. Maybe that's a lost way of teaching, but it worked. What I'd say to your boy is this: let him keep going on that piece, but make him do every heat the slow way. Draw it, check it, fix what's wrong, and don't let him rush the fire. The piece itself will show him his sloppy blows better than any square bar ever could.