How to use BS-0 semi-universal rotary and dividing head

this is a brown and sharp SEM universal rotary and dividing head I have a link in the description for the best offer I could find online if you don't have the time to watch the whole video you can just jump right to the examples by following the right links in the description I honestly think that this is simply one of the most beautiful pieces of engineering I have ever seen not just that it looks great it also allows you to do things with your drilling or milling machine that you couldn't do before you had it let me show you a few examples a shaft with 17 equally spaced holes around the perimeter is simply not possible without a machine like this or shaft with 13 holes around the perimeter of a 42 degree Scheffer or rotor blade like this though this might take some time to do it is possible to machine this with the head like this in the milling machine you can also make 2 notches 64 degrees and 40 minutes apart on a shaft these are all examples that we might never need but their purpose is to convey a message what we can do with the tool like this if we have it and know how to use it the reason this head is called semi universal and not just Universal is that we cannot make a control spiral or a thread for that you would need a different dividing head and that one would be called Universal to be honest before I bought this rotary head I didn't even know how to use it I studied the manual that came along and here is my understanding of its working this head enables you to expand your skill set to the following number one machining features some specific angular part and number two in machining some specific number of features equally distant around the perimeter of an object and we can use this machine in two modes of operation number one direct and number two indirect indexing direct indexing is simple there is a level on the side of the machine which extrude the pin and this pin goes into the direct indexing plate you should then lock the spindle with the second lever on the side to completely disable the spindle from rotating or possibly vibrating during machining this way you can divide the full circle into twenty-four divisions in other words there can be fifteen degrees or more in steps of fifteen between each of the features on your part this is direct indexing mode the indirect indexing is more interesting here you have many more possibilities to divide the full circle into equal parts or measure a certain angle almost no matter how funky the value might be in fact the smallest division you can measure on this dividing head is 0.18 37 degrees which comes from 360 degrees divided by 49 because that is the densest index plate multiplied the reduction ratio which is one fortieth in this case let's make two examples of indirect indexing that we couldn't do otherwise with the direct indexing plate first we will divide the cylinder into twenty three arcs equally spaced around the perimeter on the last few pages of the manual we can find the table and there we can see that we will need the indexing plate with 23 holes from the next example you will see that you actually don't really need a table to do that but to speed things up a little it is wise to use it from the table we can read that we will have to make one whole turn and progress additional 17 holes on the 23 whole plate and repeat 22 more times the interesting thing to note here is the use of indices we need to progress one turn and 17 holes this for example is your house we start counting holes from zero we can count 17 hose clockwise or six holes counterclockwise for this example where we have the 23 whole plate we will pinpoint the exact same hole counting from both sides we set one index two holes you're in the other 2 hole 6 this way we have measured 6 paces counterclockwise on the 23 hole indexing plate let's take a closer look at the setting first we mount the plate to need for our work [Music] then we count the number of holes in the clockwise direction in our case that is 17 holes clockwise or six holes counterclockwise on the 23 hole plate we will finish at the same call from both directions [Music] at the handle in the pin and we're ready to begin here we go one turn and 17 holes pin out we set the index for the fresh 17 holes 2 and 17 holes [Music] reset the index pin out three and 17 holes pin out and so the second example is measuring a specific angle on a cylindrical part for example 64 degrees and 40 minutes which dividing head should be used in which house should we imply a full rotation of the handle will rotate the head by 360 degrees per 40 turns equals 9 degrees per turn because there are 40 turns of the handle in a whole rotation of the head we are interested in the number of turns so we have to divide the angle by the constant we just divide from the heads property that said 64 degrees 40 minutes divided by 9 degrees equals speaking in angular minutes that makes seven turns and a hundred five hundred fortieths of a turn simplified that is seven turns and 527s of a turn and fewer lies the answer to the question which dividing plate should we use the one that enables us to divide a full circle in 27 parts that's right the one with the 27 holes and we will use five arc spaces to advance just a hundred 540's or 527s avatar let's do it them again focus on the use of the indices in the example this is the important detail from both examples first we measure the five holes on the 27 hole dividing plate logged in this is and we're good to go you enjoy using this marvelous feat of Engineering

Channel: T. T.

Views: 57,921

Rating: 4.8767333 out of 5

Keywords: dividing head, tools, rotary head, milling machine

Id: ckG1dm-EuG4

Length: 6min 51sec (411 seconds)

Published: Thu Jun 27 2019