stephen thomas
Diamond
- Joined
- Jun 3, 2001
By portable, i mean the non-machine-specific accessory that will fit any mill or radial drill so long as it has the correct shank.
As opposed to machine specific boring mill accessories.
Almost all "modern" boring heads have some form of dovetail ways and that seems intuititive.
I've seen a rare few with box ways, and have one somewhere (that came at the bottom of a box lot )but believe it to be shop made.
Recent use of one of the Universal Precision (brand) heads at any excuse got me wondering about what the first all purpose accessory boring heads might have looked like? The Universal's rectangular section slide is completely enclosed in the head. It apparently has internal gibs, but the slide essentially slides in a close fitting sideways mortise through the body of the tool. The Universal was patented in Dec, 1931. So it got me wondering what would have been the previous models or influence?
I have not taken one apart to fully grasp the method by which they work, so don't know if a dovetail slide would have given more extended travel in the same diameter. But for a 3-1/2" dia head, the slide has only 3/4" total travel. For smallish holes, sometimes you end up starting with a bar facing one direction, then as that runs out of travel, rotating it 180 deg in the slide, and going the other direction. I enjoy using the tool. Especially the way it is possible to keep dialing off radius witthout ever stopping the machine spindle until you either hit the target, or run out of travel and have to re-set the tool or install one with greater reach.
But it all got me thinking, what were the models that influenced Myers Conwell's thinking of the basic architecture, besides his own ingenious method of operation to effect precise slide movement while the tool rotates continuously?
smt
As opposed to machine specific boring mill accessories.
Almost all "modern" boring heads have some form of dovetail ways and that seems intuititive.
I've seen a rare few with box ways, and have one somewhere (that came at the bottom of a box lot )but believe it to be shop made.
Recent use of one of the Universal Precision (brand) heads at any excuse got me wondering about what the first all purpose accessory boring heads might have looked like? The Universal's rectangular section slide is completely enclosed in the head. It apparently has internal gibs, but the slide essentially slides in a close fitting sideways mortise through the body of the tool. The Universal was patented in Dec, 1931. So it got me wondering what would have been the previous models or influence?
I have not taken one apart to fully grasp the method by which they work, so don't know if a dovetail slide would have given more extended travel in the same diameter. But for a 3-1/2" dia head, the slide has only 3/4" total travel. For smallish holes, sometimes you end up starting with a bar facing one direction, then as that runs out of travel, rotating it 180 deg in the slide, and going the other direction. I enjoy using the tool. Especially the way it is possible to keep dialing off radius witthout ever stopping the machine spindle until you either hit the target, or run out of travel and have to re-set the tool or install one with greater reach.
But it all got me thinking, what were the models that influenced Myers Conwell's thinking of the basic architecture, besides his own ingenious method of operation to effect precise slide movement while the tool rotates continuously?
smt