La semana pasada estaba yo trabajando con mi viejo taladro barato made in China, cuando súbitamente, sin haberlo esforzado más de lo normal, comenzó a fallar, a chisporrotear y a largar una humareda por los agujeros de ventilación. Obviamente, se quemó el motor. No me molestó demasiado porque al fin y al cabo duró casi 8 años, y por el precio que pagué por él, no se puede pedir milagros.
Hoy a la tarde me di una vueltita por Walmart y me compré otro taladro de esos baratos chinos, pero el mandril no es de los que a mí me gustan, de esos que se ajustan a mano sin necesidad de herramienta. No importa –me dije– en casa le pongo el mandril del que se quemó. Efectivamente, así ocurrió, y acá les cuento cómo se hace.
I guess there must be many of you who have a broken or unhelpful drill chuck, and would like to change for another better, but do not know how. That happened to me a few years ago, and found that it is not difficult, you just have to know a little secret.
Last week I was working with my old cheap Chinese drill, when suddenly, without having done more force than usual, it began to fail, to sizzle and emit smoke by ventilation holes. Obviously, the motor burned. Do not bother me too much because after all it lasted nearly 8 years, and for the price I paid for it, you can not ask for miracles.
This afternoon I took a little walk to Walmart and bought another of those cheap Chinese drills, but the chuck is not that I like, those that fit by hand without tools. No matter, I told myself; at home I put the chuck from the burned drill. Indeed, it happened, and here I'll tell you how.
Step 1: Qu� Se Necesita (what You Need)
First, at least a drill chuck which does not work or is not appropriate. In addition, a chuck who do want to use in its place. Phillips and/or flat screwdriver, rather flat pliers to hold the shaft (must be able to enter in the slot below the chuck), and eventually a vise grip.
Step 2: Manos a La Obra (hands at Work)
The first thing to do is remove the chuck to replace. I had to remove both, for the reasons explained in the introduction. To do this you have to open it to its maximum potential, in my case 13 mm. In the bottom of the hole where the bit would go, there is a "bisexual" screw (phillips and flat head at the same time). THE MAIN SECRET: that screw is left hand thread, so if you insist on loosening as with a screw "normal", what you will do is tighten it more and more, and possibly break it, thus losing the possibility of replacement.
Step 3: Extrayendo El Mandril (extracting the Mandrel)
ANOTHER LITTLE SECRET:: now the chuck is screw threaded normal, so you have to hold the shaft with a flat pliers and rotate it to the left normally. In my case, the new drill loosened at the first try, but that I was using was "stuck" and I had to take it apart and tighten the chuck on the vise grip, and rotate the shaft with pliers to remove it. These are the tricks of the trade, without which everything would be boring.
Step 4: Colocando El Mandril (placing the Chuck)
It is almost redundant to say that the placement of replacement chuck (and do not say "the new chuck" because in my case is just the reverse) is to reverse the steps above. That is, first screw the chuck, tight enough for a secure fit. then open at maximum position and then screw the left screw will keep it in place. DO NOT FORGET THAT IT ROTATES BACKWARDS. That's all.