One of the challenges with the projects we are working on is adding a hinged door to various manufacturer’s gear where the door was fixed mount prior. Meaning bolted in place, a cover. I took my first whack at this in 2023 for a different client/projects. In that case I attempted to machine dimensionally same/similar to a formed sheet metal hinge they provided. The parts looked nice, but it just didn’t work.
This time the client designed a more universal hinge. It can work with three different mounting hole spacings. I was short on available time, so these are being made out of A36. The next batch will be 1018 or maybe stainless. Plan is to have future batches plated.
The fixed leaf was pretty straight forward for the first two operations. This is the end of day 1:


Fixed lead only has pin hole boring left, and OP1 of moving leaf is done. Boring the pin holes was on my mind the whole time. I finally came up with an idea…


The mounting surface is in a pocket on the front soft jaw. The tower that needs a hole poked in it is sitting on a plain rear jaw. Then I realized I could do the same for the moving leaf. One way to gain some efficiency is reusing setups. This one setup was used to bore both fixed leaf holes, the moving leaf holes, then some additional work later.
Family photo after machining is complete:

The first time I slid the pin in place was really satisfying. Because of the 4.5 outside length, I couldn’t line bore the holes.

The setup worked really well. The pins are 0.245 and I use a letter D drill (0.246). The pins slid and were a little snug. I reamed the holes with a 0.249 reamer. Now the pins drop in place. Exactly what the part needs. The moving leaf is bored with a D taper length bit. It worked out really well.


Next is tumbling, then quick sandblast, then powder coat. Install is this weekend.
I’m well aware this is an enormous amount of work “for a hinge”. This is an enormous project for the company and it all makes sense for the business. Now that I know how I want to make them, I’ll most likely set the orange vises up double station and run 8 parts per cycle.
For anyone interested in the tooling. This Haas 5 flute end mill is really impressive, even on my smaller machines.

This time the client designed a more universal hinge. It can work with three different mounting hole spacings. I was short on available time, so these are being made out of A36. The next batch will be 1018 or maybe stainless. Plan is to have future batches plated.
The fixed leaf was pretty straight forward for the first two operations. This is the end of day 1:


Fixed lead only has pin hole boring left, and OP1 of moving leaf is done. Boring the pin holes was on my mind the whole time. I finally came up with an idea…


The mounting surface is in a pocket on the front soft jaw. The tower that needs a hole poked in it is sitting on a plain rear jaw. Then I realized I could do the same for the moving leaf. One way to gain some efficiency is reusing setups. This one setup was used to bore both fixed leaf holes, the moving leaf holes, then some additional work later.
Family photo after machining is complete:

The first time I slid the pin in place was really satisfying. Because of the 4.5 outside length, I couldn’t line bore the holes.

The setup worked really well. The pins are 0.245 and I use a letter D drill (0.246). The pins slid and were a little snug. I reamed the holes with a 0.249 reamer. Now the pins drop in place. Exactly what the part needs. The moving leaf is bored with a D taper length bit. It worked out really well.


Next is tumbling, then quick sandblast, then powder coat. Install is this weekend.
I’m well aware this is an enormous amount of work “for a hinge”. This is an enormous project for the company and it all makes sense for the business. Now that I know how I want to make them, I’ll most likely set the orange vises up double station and run 8 parts per cycle.
For anyone interested in the tooling. This Haas 5 flute end mill is really impressive, even on my smaller machines.

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