This article will be interesting to everyone who has a lathe in the workshop. Both amateurs and professionals. The author of the channel "Make it Extreme", often faced with the need to process large parts on a lathe, decided to make a lunette for him.
it device allows you to process workpieces of large diameters and lengths with high accuracy. Using it, an additional support is created for the second edge of the workpiece, which is difficult to fix with a standard tailstock.
The author has such a lathe, it is for him that the device will be made.
Instruments.
1. The lathe.
2. Drilling machine.
3. The welding machine.
4. Plasma cutter.
5. The grinder.
6. Miter saw.
7. Small things - hammers, drills, etc.
Materials
Steel plate 25 mm thick.
Steel strip, sheet.
Hairpin with a diameter of 12 mm.
Bearings, bolts, washers, nuts ...
Paint.
For starters, it measures the dimensions of the guides.
Then, the lowermost part of the base is cut from a steel plate, on which the lunette will be fastened.
Trying on a workpiece to the guides, it will be under them.
In its center, drills a hole for clamping, starting with small diameters drilled.
The bolt will act as a clamp, insert it into the hole and clamp it with nuts.
Now the author fixes the bolt head by welding on one side.
Then he turns over the workpiece and boils the second half of the bolt head.
Installs under the guides and puts on the second part, puts on the washer and tightens the nut.
This is a mechanism for fixing the position of the rest on the rails. With a squeezed nut, it moves easily.
By tightening the nut, the position is fixed.
The sizes came up, and since the upper part was just stuck with welding, it welds the seams.
From the same steel plate makes the last, topmost part of the base. And in order to have access to the clamping nut with a socket wrench, a hole is drilled in it with a crown.
From sheet steel, the author cut out such blanks for the lunette case.
And here is the plasma cutter.
Part blanks are cut off from the body blanks so that they have an even edge for installation on the base.
Cleans a slice with a grinder.
Drills holes for connecting bolts.
Inserts a bolt with a nut on into the drilled hole, and tightens the elongated nut.
Then he puts the second panel and fixes it with bolts.
Tightens the bolts.
Prepares the base for welding.
The seam turns out - just a sight for sore eyes.
Installs two panels on the base. This is how they will look together.
Welds the frame to the base.
Cleans the seam with a grinder.
Pay attention to the base profile.
He starts assembling the bodies of adjustable clamps, they will need three. For them uses a steel strip.
The extended nuts are inserted between the strips, clamped with a clamp.
Spreads two more pairs of nuts, inserts the last strip.
It grips by welding spotwise along the entire length, does not weld nuts, only strips between each other.
Having removed the nuts, boils the seams.
Having marked the resulting rectangular profile pipe, it cuts with a miter saw. The pipe profile turned out to be rectangular due to the shape of the nuts; the hexagon does not fit into the square.
Three pieces are cut from a hairpin.
Clamps the workpiece in the lathe chuck and grinds part of the thread.
Cut the new thread first with a cutter, then with a lerka.
Screws the "lamb" (handle - twist).
This is how the clamping mechanisms in assembly will look.
Clamps a profile in a vice, and drills a hole for the fixing screw. Then cuts the thread.
A square was welded from the end of the profile, and drilled a hole for the stud.
Having placed the clamps in places on the frame of the body, welds them.
I installed bearings on the ends of the clamps, checks the convergence in the center and alignment of the machine chuck.
On a bending machine, it makes the remaining body parts from a steel strip.
Cutting the ring into arcs, fits them to the frame. And boils the seams.
After cleaning all surfaces - finish spray paint.
Everything is ready, you can check on the workpiece from the pipe. Between the bearing and the pipe lays a very thin plate, so that the bearing does not crush.
After tightening the fixing screw, the plate is removed.
In the same way, it adjusts the remaining clamps.
Everything can be processed!
Thanks to the author for the excellent performance of such a very necessary device!
All good ideas and an obedient tool!