How to build KMG type belt sander

KMG 2”x72” belt sander for knife making. Construction  Instruction for beginner.  Part 7.

Commissioning the sander

Before you start the motor for the first time, try to make sure that all the pulleys and the platen are align. Start the motor, using the lowest possible speed.

It is out most important to make sure that the rest table is parallel, dead right angle and align to the platen. If not you will find it impossible to symmetrically shape the bevel on both sides of the blade .

Do start your practice on the sander by using a jig. Here you can see my primitive jig. I use the nails as marker to make sure that the position of the blade is exact on both sides.

jig fo knife making             jig for knife making

jig for knife making

The internet is full of jig design, so go there and choose one that you like.

My is not particular good. The bolt to adjust the angle of the jig is scrunching the rest table and I suspect it will ruined it in the end. I saw one that look promising on the internet. I don’t know who made it, but look on the web.

jig for knife making

If your belt sander is not dead straight, you will find that even with jig it’s difficult to make the blade bevel symmetrical. One way to solve that problem is to free hand sand the blade. Don’t use jig, just hold the blade with your hands ( the internet is full about that technique).

I started with a jig but I found that the more experience I obtain using the belt sander, the more I can use the free hands technique.

Word of advice.

I been trading two of my knives with nice well equipped table router. So I was very anxious to start using the machine. I forged out of old  car suspension spring coil two nice blades.

hand made knife

Took it to the belt sander and,,,,,,,, ruined it.

For the last twelve years  I built my knives using nothing (mainly) but hand tools. What do I know about using belt sander?

So, make yourself (or get it from some ware) few knives blanks from mild steel  (it is easier on the belt) and practice. Also you can practice on wooden blank, it is not the same as steel blank but it will give you idea about the grinding pattern on the blade.

Don’t, don’t start with blade you want to do knife with, until you confident that you can do it.

Last word on How to build a KMG type belt sander

As I mention on the first post, I thought to publish(for the British crowd) the parts supplier’s names. But by the time you will read the post (GOOGLE do not favour with me) they will probably cease to exists.  Instead I tried   to write the parts professional names, so you can look for them on the net.

Due to my limited knowledge in web blog design. I can’t post PDF or DWG files. If you want  KMG 2”x72” belt sander DWG or PDF files, well you will have to email me and I can email it to you.

That it.



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How to build KMG type belt sander

KMG 2”x72” belt sander for knife making. Construction Instruction for beginner. Part 2.

Construction of the machine.

Continuo of my article of  how to build KMG type belt sander.

As I mention in the last post, I cut all the steel (engineer’s grade mild steel) items using laser cutting specialist.

To save money I add to use two pieces of steel for the tool arm(Parts D), but I recommend to use one piece. It is very important for the arm tool to be dead straight.

Prior to welding you want to drill all the hols and do all the threads that needed. I marked them all on the drawings. As i know myself, it is possible that I made a mistake, so please check it.

I started by well the two (Parts D) pieces together. As you will see, I am not a welder, so I add to learn how to do it from the internet. I can recommend you two web site with good instruction.

how to build belt sanderI then moved to build the main body (parts A,B,C). Assemble all the parts around the now one piece tool arm, jest to make sure you will not mess with the order that you are going to weld it.

how to build belt sanderYou need pay attention for two things. One is to make sure that the pieces are 90˚ to each other.

And that you need to live slight gap between  the main body and the tool arm. I would say 1mm on the vertical side and one on the horizontal side. That is to enable the tool arm to slide nicely inside the main body.

how to build belt sander           how to build belt sander

After welding you can grind the welding mark. If you do so make sure you grind it flat as possible as you still need to weld few more items on to the top side of the main body.

how to build belt sanderIn hind sight you i should have assemble the part in away the well will be on the sides and not on top and bottom. That will ensure the top to be flat. If you do that you will have to change the dimension of parts A,B and C.

Now it time to attached bearings ‘bracket’ (parts F) to the main body.

Bolt the two F parts to achieve the exact width and make sure they are parallel to each other. Then position them in the right location under main body and make sure in is in 90 ̊to it and clump it.

You can use set square or one big lump of steel.

how to build belt sander             how to build belt sander

Now weld the front leg (Part E)

how to build belt sander             how to build belt sander

And lastly you need to attached legs base (parts G) and the leg for the tracking pulley hinge.

how to build belt sander

I advise you to mark the position of the parts by using   ‘engineers marking out fluid’ as a back ground for the scribing mark. you can use heavy duty felt tip marker. It is do the job just as well and cost a lot less, and last longer.

That it. in the next post I will continue with assembling the tracking hinge and the  tension spring.







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