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This Miter Framing Machine (a.k.a. Manual Underpinner or V-nailer) is perfect for anyone looking to quickly and accurately produce high-quality, professional picture frames - all with just the press of a pedal! The Model T27577 features dual foot pedals for front or rear operation, extension tables for supporting long picture-frame mouldings, vertical and horizontal stops for securely holding a wide variety of moulding profiles, and front and rear fence stops for precisely positioning V-nails. With its small footprint, this framing machine can easily fit into tight spaces, yet also offer big-time versatility. It can accommodate up to five standard "universal type" V-nail sizes, produce stacked nails, and make 4-, 6-, or 8-sided mouldings with the included fence inserts.


  • V-nail channel capacity: 350 V-nails
  • V-nail sizes: 5, 7, 10, 12, 15mm
  • Frame/moulding width range: 1/4"–3"
  • Frame/moulding thickness range: 1/4"–3-1/2"
  • Floor to table height: 37-1/2"
  • Extension tables: 13-3/4"W x 13-3/4"D
  • Overall size: 28-1/2"W x 48-1/2"H x 30"D
  • Footprint: 15"W x 18"D
  • Approximate shipping weight: 121 lbs.
  • Dual foot pedals for front or rear operation
  • 90°, 120°, and 135° fence inserts for 4-, 6-, and 8-sided frames
  • Indicator light for completed V-nailing (9V battery required)
  • Spring-assisted loading mechanism with nylon pull-cord for easy V-nail loading
  • Rubber-tipped top clamp with simple push-button vertical adjustment
  • Powder-coated steel base and extension tables; cast-iron main table

2 Customer Reviews (4.5 out of 5 stars) : Sign in to write a review

Anonymous Reviewer
Easy to use once you get the hang of it 12/24/2019 5:19:50 PM

I'm new to making picture frames so this was my first experience with an underpinner. Some of the grief I experienced was my inexperience, but that was compounded by an error in the instruction manual. The manual says to put the v nails in with the glue side "down". As it turns out, that orients the v nail with the blunt edge facing up. I'm using soft wood (pine) which requires a v nail with a sharp edge that will cut the wood grain. Thinking I had ordered the wrong v nails, I ordered some more from someplace else as the ones on the Grizzly site gave no indication that they were for either hard or soft wood. When the new v nails came in I noticed the sharp edge was on the glue side (the glue was clear on the new ones so the edge was visible while the glue edge on the Grizzly v nails was brown and obscured the sharp edge) so I put them in glue side up and they worked as they should. Once I discovered that the Grizzly v nails worked with the glue side up I tried them and they worked well too. Because I hadn't used an underpinner before, I didn't realize that the pressure of the pad above the stock was directly related to the machine's ability to drive the v nail to the desired depth. Took some doing for me to find that sweet spot. I think the pressure pads are a weak spot. The round one kept popping off of the metal piece it's screwed into and I think that's because the part that screws into the metal is rubber. A little superglue seems to have fixed that issue. We'll see how it holds up over time. I like the machine and think it will help speed up the process of making the frames. Having the option of working from the back side of the machine is a huge plus if you're making bigger frames, (I make a lot of 36x24) even at 6' 3" with long legs, it would be difficult at best to assemble the two halves from the front. I'm giving it 4 stars primarily for the "glue side down" reference in the manual. If it weren't for that, my initial experience and frustration level would have been a lot less. If you're looking for a well made manual underpinner that's sturdy and should last for years, then this one is worth consideration. I'm glad I purchased it.

Anonymous Reviewer
07/20/2017 7:17:36 PM

I am starting a mobile picture framing business and this exactly what I've been looking for. It allows me to operate it from both sides, which is a plus. To go with this, you need to build a mat cutter and a graduated miter saw for the rabbits in picture frames.