Agregado el 21/05/13: vea https://www.instructables.com/id/Mejoras-a-mi-KISS-lathe-my-KISS-lathe-upgrades/
My poor man's lathe has some strengths and some flaws. Of these, the most annoying is the noise: When I do work at the same time the grinder and drill, the neighbors are owed bristle hairs. So I thought I could try to build another, not having that problem. I also wanted to capitalize on the experience I left the building before, so no work for nothing or at least improve my efficiency. So I adopted the KISS protocol (Keep it Simple, Stupid), which in my time as an systems analyst-programmer proved their worth. Another tactic that I have adopted with good results is to work without plans, duly solving every situation with the items I have on hand. Because it is cool to name things, we might call it WWPT (Working Without PlansTactic).
Addedmay 05 2013: see https://www.instructables.com/id/Mejoras-a-mi-KISS-lathe-my-KISS-lathe-upgrades/
Step 1: Seek and Find (buscad Y Encontrar�is)
Así que levanté la tapa de chapa, vi que estaba con motor y todo, lo conecté a 220V y ¡aleluya! funcionaba perfectamente. Por supuesto, tenía tanta mugre encima que daba pena. Me puse a restaurarlo, lo hice revisar por un experto que me confirmó que los rodamientos no necesitaban reemplazo, lo limpié lo mejor que pude, le lavé los rulemanes, los engrasé, le agregué una tapita protectora para retener la grasa, le cambié algunos tornillos, y para terminar le di dos o tres manos de pintura. No sé qué potencia tiene porque perdió la chapita con las especificaciones, pero por el peso calculo que es de 3/4 o 1 HP
Thinking and thinking, I remembered I had been stuck in the backyard an old water pump from the house that my daughter bought a few years ago. My son-in-law took it out because it was not used and annoyed, and he'd throw it away. Since I am among those who do not discard an eggshell, I asked it, just in case one day it serves me.
So I lifted the cover sheet, saw it was with motor and all, I connected it to 220 V and hallelujah! worked perfectly. Of course, it had so much dirt that was sad. I began to restore it, I did review it by an expert who confirmed that bearings needed no replacing, I cleaned it as best I could, I washed the bearings, oiled them, added a protective cap to retain the grease, changed a few screws , and finally gave it two or three layers of paint. I don't know how much power it have, because it lost specifications label, but I estimate 3/4 or 1 HP because its weight.
Step 2: Direction of Rotation (sentido De Giro)
I noticed the engine rotates reversed, which as a pump will not affect it at all, but using it as lathe would be complicated because the turning pieces are loosen when subjected to the cutting tool. Fortunately, I remembered that reversing a pair of internal winding wires are reversed the direction of rotation. I did it in a while, without incident.
Step 3: The Chuck (el Mandril)
What would I use as chuck? At first I thinked to use the small pulley that brought the engine, but then I thought it meant ruin it, and having at home many pieces of iron pipe, the best thing was to make a bespoke piece. I took a tube that almost did not enter the shaft, I made it a longitudinal cut, opened it a bit and when it was molded to the shaft, I welded a nut to tighten the shaft with a screw. At one end of this pipe I welded a pair of big thick washers, and at the central hole of these, three smaller washers, which in turn had welded a quite robust lag. Later I added a nut made of hard wood, used to hold flat pieces of wood. Later I will make other chucks, for different tasks.
Step 4: The Chassis (el Chasis)
Luego le soldé a la base dos largueros de hierro en L de 1 pulgada, como rieles, para deslizar sobre los mismos el portaherramienta. Mediante dos pequeños trozos de hierro plano de 1/8 pulgada por 1/2, me aseguré de que quedaran medianamente paralelos al soldarlos. La longitud de los largueros la fijé más modesta que en el torno anterior, porque todo tiene su pro y su contra: a mayor capacidad, más dificultades de almacenamiento. Me fijé como meta poder tornear objetos de pequeño y mediano tamaño. De todas maneras, puedo agrandarlo si hubiera necesidad. A los largueros les puse patitas de goma, fijadas con pequeños tornillos, para que no queden apoyados sobre la mesa en toda su longitud. Además, absorben un poco las vibraciones.
Now came the matter of mounting the engine on a bench to lift the spin axis enough to turning a large plate or a medium bowl. Among the pieces of iron that I keep, found a piece of profile, that I rescued a few months ago at the construction site of my son's house. Because its shape was trapezoidal, I cut one end and soldered it by turning 180 degrees, so as to turn it into a rectangle. At that base, which just happened to be the size of the engine base, I made the four holes needed to fasten it, and under the holes I welded nuts, to simplify the task of puting and removing the engine.
Then I welded two beams of 1 inch L angle iron to the base, as rails, to slide the tool holder over them. Using two small pieces of flat iron 1/8 inch by 1/2, I was fairly sure that they are parallel before weld. I decided the rails's length more modest than the previous lathe, because everything has its advantages and troubles: higher capacity means more storage difficult. I set a goal: to be able to turning small and medium size objects. Anyway, I can enlarge it if the need arises. For the rails I put rubber feet, fixed with small screws, so there are no resting on the table along its length. Besides, they absorb some vibration.
Step 5: The Tool Holder (el Portaherramienta)
To make the tool holder, or rather the tool support, since the lathe will be mainly for wood, I used a square piece of iron pipe I found in the garage, left over from a previous job. At first I gave it a closed L shape, but then I realized that I would find it difficult turning around the center of rotation, so I added an elbow, which the L was close to some C shape. In the first version, I made holes 90% crossed at its top, so I can screw the tool rest parallel or perpendicular to the rotation axis. Later I decided to replace the pair of holes with a vertical piece of pipe, let me turn quickly to any angle between 0 and 180 degrees the tool rest. The holes remains partially, as memories of its evolutionary past.
Step 6: Sliding (desplazamientos)
Now came the mechanisms of longitudinal and transverse sliding, that in the first lathe I had too much work. I remembered the KISS principle (Keep It Simple, Stupid) and decided do not complicate my life. So I simply did two equal square brackets, each with two nuts that fasten a piece of iron plate, like a vise grip, robust enough to avoid the risk of fail if the tool is nailed to the turning piece, which happens when one does not know to do the job. These brackets allow both movements (longitudinal and transverse), and all I have to do is loosen four nuts, relocate the tool rest and re-tighten the nuts. Maybe later I will make a lever mechanism that reduces everything to a single movement, but I will do it only if the work/benefit relation is really convenient.
Step 7: Wiring (cableado)
The electrical part, at beginnig was reduced to adding a 2-meter cable with a plug to the motor, but then I got tired of walking plugging and unplugging the engine, so inserted a push button switch mounted on a piece of wood to be operated with the foot. It has the advantage that if I have to neglect the work, I don't have to worry about turning off the engine because raising the foot, the power supply cut off. When I go to touch with the hands the piece is machined, or I have to adjust the position of the collet, I push the switch under the table, to avoid inadvertently stepped on and cause an accident.
Step 8: Futurismo Y Ciencia Ficci�n (Futurism and Science Fiction)
- Aprender a usarlo e ir detectando problemas a solucionar o mejoras necesarias.
- Reforzar algunos puntos donde la soldadura no quedó del todo bien
- Hacer algunos mandriles alternativos
- Hacer una contrapunta
- Masillar, lijar y pintar
- Learn to use it and go find some problems to solve or improvements.
- Reinforce some points where welding was not quite right
- Make some alternative chucks
- Make a tailstock
- Putty, sanding and painting
Step 9: Agregado El 25/11/10 (added Nov 25 2010)
Here are two more odd jobs, made with the lathe. Both have flaws, they are only attempts. Little by little I am learning to turning. Well, Lula Da Silva started just like that...