![Toolmakers Clamps (mistakes were made). [2048x1136 - 305KB]](https://pic8.co/sh/qJFlm9.jpg){kind=link}
Here's my first project on the new Milling Machine (Optimum MB4 clone), It's a pair of Toolmakers Clamps made from some rusty old 5/8" square bar I picked up from a scrap yard.
Here's the raw material (the round bar was later replaced with some newly acquired 12mm round that I forged the handle spirals on). Got to put my new horizontal bandsaw to use in this one too. https://pic8.co/sh/H7eurK.jpg
Step 1 was to square up the stock. Starting with one edge held against the fixed jaw of the vise (with a piece of soft wire between the other edge and the moving jaw) and only one corner resting on a parallel, I cleaned up one side. The piece was then rotated so the newly flat side was against the fixed jaw and the process repeated. The last face didn't need the wire on the moving jaw and could use two parallels as both clamped sides were flat and parallel. https://pic8.co/sh/Z9isLA.jpg
From the original ~16mmx16mm size, they were taken down to 12mm x 14mm. They were to be 100mm long, but ended up being 99mm long. This was because my set of end mills that I brought had an 18mm end mill in the spot that was labelled 16mm. Turned out, the shank of the mill was 16mm, but it was indeed an M18 bit. So, when I set the DRO to 108mm from the vise stop, I was expecting to take the end down to 100mm exactly, but instead got 99mm.
Holes were then drilled, the bottom bars receive two threaded holes, I used M7 x 1.0 thread, as this was a reasonably fine thread that had a slightly larger diameter than M6, and I also had ok looking taps and dies for it. https://pic8.co/sh/iQhfqM.jpg
The top pieces were a little more complex, the back hole was a blind, flat bottomed 5mm hole that was drilled with a 2-flute slotting drill to a depth of 6mm. The middle hole was clearance for M7 with a 10.5mm pocket that was 2mm deeper than the cutaway and a 1.5mm deep cutaway that would recess the retaining plate. A blind tapped M3 hole was also added to take a countersunk M3 screw that would hold down the retaining plate. https://pic8.co/sh/Q9lYvk.jpg
The biggest mistake here was that I, for some stupid reason, put the recess for the retaining plate on the wrong side of the middle hole. It was supposed to be behind it, which would leave more room for a shallower slope on the nose. That error constrained the angle that I could cut the nose, in the end not a big deal though. I also fucked up when milling the 10.5mm pocket. Since I don't have a 10.5mm end mill, and wanted a flat bottom, I plunged in with a 10mm, then moved around in a rectangle 0.25mm from the origin. But, I got my directions mixed up once, and accidentally took off more than I wanted, leaving a very thin wall thickness on one of the parts. Again, this is of no material consequence, but an important lesson to learn so I don't fuck up on something that is important.
To make the retaining brackets, I used an offcut of 25mm square tube. This had the benefit of being it's own clamping jig. First I milled in from the side and side milled down the wall thickness to about 1.5mm. Then I flipped it 90deg, milled out the main pocket, which was 7mm wide. Again, I don't have a 7mm end mill, so I did a similar thing, moving a 6mm end mill over 0.5mm each way to get the desired width. Then a 3mm hole was drilled for the screw. This was countersunk with a 5.5mm drill, as the screws I had had a very shallow bevel to them. Once the drilling was done, the 6mm end mill was used to cut slots to define their width, then the back was very carefully milled down until I had just a sliver holding them on, that I could break off easily. https://pic8.co/sh/gLIEOx.png
I originally turned down one of my bits of round bar and knurled a handle on it. Then I used my M7 die to cut the thread with it mounted in the lathe. But, since it was such a long thread, the die wandered around a bit, and the resulting thread was shithouse. I couldn't hold it straight in a collet chuck to do the remaining operations. I would need to make a new one. So, I decided that rather than just putting a knurl on the handles, like every single bought one that costs $20, I would forge a twist into some round bar to act as the grip.
To do this, I laid out the 4 places that I would need to twist. These were forged down square, then twisted in my leg vise. I don't usually get photos of that process as you need three hands just to do it, and you only have seconds to do it before it cools too much. https://pic8.co/sh/zXoIB3.jpg
Once forged, put centers in each end, turned a nominal size between the pairs of twists then cut them into individual segments. These could be held in the chuck and live center for turning down the rest of the features and single point threading. https://pic8.co/sh/13is4t.jpg
Once some cross holes were drilled in the handles, everything was done.
Here's an exploded view of all the parts (for one clamp): https://pic8.co/sh/g2d7PQ.jpg
They turned out really nice. They have an excellent feeling of quality to them, the threads and fits are crisp (some need a little wearing in). Probably still needs a little filing and sanding to take off a few last little burs, but overall they turned out well.
On to the next project....
Here's my first project on the new Milling Machine (Optimum MB4 clone), It's a pair of Toolmakers Clamps made from some rusty old 5/8" square bar I picked up from a scrap yard.
Here's the raw material (the round bar was later replaced with some newly acquired 12mm round that I forged the handle spirals on). Got to put my new horizontal bandsaw to use in this one too.
https://pic8.co/sh/H7eurK.jpg
Step 1 was to square up the stock. Starting with one edge held against the fixed jaw of the vise (with a piece of soft wire between the other edge and the moving jaw) and only one corner resting on a parallel, I cleaned up one side. The piece was then rotated so the newly flat side was against the fixed jaw and the process repeated. The last face didn't need the wire on the moving jaw and could use two
parallels as both clamped sides were flat and parallel.
https://pic8.co/sh/Z9isLA.jpg
From the original ~16mmx16mm size, they were taken down to 12mm x 14mm. They were to be 100mm long, but ended up being 99mm long. This was because my set of end mills that I brought had an 18mm end mill in
the spot that was labelled 16mm. Turned out, the shank of the mill was 16mm, but it was indeed an M18 bit. So, when I set the DRO to 108mm from the vise stop, I was expecting to take the end down to 100mm exactly, but instead got 99mm.
Holes were then drilled, the bottom bars receive two threaded holes, I used M7 x 1.0 thread, as this was a reasonably fine thread that had a slightly larger diameter than M6, and I also had ok looking taps and dies for it.
https://pic8.co/sh/iQhfqM.jpg
The top pieces were a little more complex, the back hole was a blind, flat bottomed 5mm hole that was drilled with a 2-flute slotting drill to a depth of 6mm. The middle hole was clearance for M7 with a 10.5mm pocket that was 2mm deeper than the cutaway and a 1.5mm deep cutaway that would recess the retaining plate. A blind tapped M3 hole was also added to take a countersunk M3 screw that would hold down the retaining plate.
https://pic8.co/sh/Q9lYvk.jpg
The biggest mistake here was that I, for some stupid reason, put the recess for the retaining plate on the wrong side of the middle hole. It was supposed to be behind it, which would leave more room for a shallower slope on the nose. That error constrained the angle that I could cut the nose, in the end not a big deal though. I also fucked up when milling the 10.5mm pocket. Since I don't have a 10.5mm end mill, and wanted a flat bottom, I plunged in with a 10mm, then moved around in a rectangle 0.25mm from the origin. But, I got my directions mixed up once, and accidentally took off more than I wanted, leaving a very thin wall thickness on one of the parts. Again, this is of no material consequence, but an important lesson to learn so I don't fuck up on something that is important.
To make the retaining brackets, I used an offcut of 25mm square tube. This had the benefit of being it's own clamping jig. First I milled in from the side and side milled down the wall thickness to about 1.5mm. Then I flipped it 90deg, milled out the main pocket, which was 7mm wide. Again, I don't have a 7mm end mill, so I did a similar thing, moving a 6mm end mill over 0.5mm each way to get the desired width. Then a 3mm hole was drilled for the screw. This was countersunk with a 5.5mm drill, as the screws I had had a very shallow bevel to them. Once the drilling was done, the 6mm end mill was used to cut slots to define their width, then the back was very carefully milled down until I had just a sliver holding them on, that I could break off easily.
https://pic8.co/sh/gLIEOx.png
I originally turned down one of my bits of round bar and knurled a handle on it. Then I used my M7 die to cut the thread with it mounted in the lathe. But, since it was such a long thread, the die wandered around a bit, and the resulting thread was shithouse. I couldn't hold it straight in a collet chuck to do the remaining operations. I would need to make a new one. So, I decided that rather than just putting a knurl on the handles, like every single bought one that costs $20, I would forge a twist into some round bar to act as the grip.
To do this, I laid out the 4 places that I would need to twist. These were forged down square, then twisted in my leg vise. I don't usually get photos of that process as you need three hands just to do it, and you only have seconds to do it before it cools too much.
https://pic8.co/sh/zXoIB3.jpg
Once forged, put centers in each end, turned a nominal size between the pairs of twists then cut them into individual segments. These could be held in the chuck and live center for turning down the rest of the features and single point threading.
https://pic8.co/sh/13is4t.jpg
Once some cross holes were drilled in the handles, everything was done.
Here's an exploded view of all the parts (for one clamp):
https://pic8.co/sh/g2d7PQ.jpg
They turned out really nice. They have an excellent feeling of quality to them, the threads and fits are crisp (some need a little wearing in). Probably still needs a little filing and sanding to take off a few last little burs, but overall they turned out well.
On to the next project....
(post is archived)