A simple tool with your hands to assist with drilling crown - Overview

We have been waiting for a new survey on the instruments with their hands? Here he is! Long for you to look for an interesting tool, I hope you will be able to surprise.

Looking ahead, I should say that the instrument to which I will review today is not entirely unequivocal, but that analyze each of the points. (How does this work will show at the end)

Idea

Grade 3 and 5

The idea of ​​this author tool It is to make crafts their own hands, Which would be able to drill a smooth hole with a crown.

In the analysis of this idea, the first question that I asked myself, why is it necessary? After all, most of the bits for drills with a drill going in the middle of the crown, which helps precisely to saw a hole.

I do not want to be highly critical of the author and his invention, and let's think about what we need to drill a hole in the crown which will not drill?

• crown for drill was initially without drill
• must obtain roundels (waste) without a hole in the middle
• drilling at the site already has an opening width larger than the drill bit for otsentrovki.

I only visited three of these ideas, which may be useful a tool therefore commended the ideas put, unfortunately, I can not.

Design

Evaluation 3 of 5

Like many of his previous works, the author makes this tool a sheet metal thickness of about 5-6 mm. Metal sheet cuts a triangle with truncated tip (something like a trapezoid).

On the smaller side, formed trapezoid is fixed two bearings, which operate the retaining function.

In this section, we will not speculate why we need such a tool is what we have done enough in the previous section.

Assessing the only constructive solution tool to assist in drilling holes, it can be said that the structure is made quite safe, but there is one of the biggest drawbacks.

It seems to me, in this arrangement, the bearings, which are used by the author in his tool may jam due to misalignment, and I would suggest that in this design to put the puck.

Design

Rating 0 of 5

I, in this self-made instrument did not see any visual component, for which one could put the assessment in this section. Alas, I have to assess the minimum number of balls possible.

I honestly do not understand why it is so difficult to give a simple color his instrument.

analogue

Evaluation 2 of 5

As already noted in the first section of the idea that there are ordinary crown. They can be bought at the hardware store, the middle of which a drill is available.

This drill helps to drill a hole exactly. Does cheaper version of the author? I doubt it. It makes sense to do so tool with their own handsOnly in some specific situations.

Total

Evaluation 8 of 20

As a result, we have 8 out of 20 points, in my opinion, the assessment of the crafts a well-deserved. The functionality is quite limited, and vryatli You will need to repeat it.

video source and images for the critical review: https://www.youtube.com/watch? v = zXVWWPNctM8