Help with using a dremel!!

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Jul 14, 2010
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I have never picked up a dremel before in my life. My grandfather (R.I.P) used to love making things with his hands. Anyway, I found this knife he was working on, looks like a bowie or a survival knife of some sort. With sharpie marker, he drew on several points of the knife that he wanted to have steel removed from the blade. I would very much like to finish this job. I have NO idea what pieces to use, how to round off sharp corners so they are smooth, etc. Is there a video that shows how all this stuff is done? Can anyone give me any pointers? The part of the blade that needs to have steel removed is all ready marked with a sharpie I think, I just need to remove that metal and polish it up. I'm not 100% on the steel...it might be S30V, 154CM, D2, S90V, I can't tell...there are no markings on the knife. I found a book that has some numbers in it and saw these steels mentioned in there. I know he was using a dremel to complete his works....please, if you have any suggestions for me, I would really appreciate it. I'm sure I can figure out how to make a straight cut, it's making curves that has me worried. That, and I also saw in some videos where some guys where not allowing the knife steel to get too hot. Again, any tips/pointers would be greatly appreciated. THANKS!!
 
Start by looking through the stickies at the top of the shop talk page. You will find all kinds of stuff. Then you can ask more specific questions one you understand the basic process. Good luck as I know the sentimental value of something like that.
 
I am more of a lurker around here but I have to chime in on this as recently I have lost to many loved ones and just spent $300 to fix my grandpas drillpress when I could have bought one for half that so I get it. I am also not nearly the knife maker many on here are but I have made a few and messed up a few more. so my 2cents is set grandpas knife aside try to find out more about it like what steel it is and make a knife or 10 of your own so when you mess it up its yours and not grandpas then finish the one he started when you have a better idea of what to do or not do.
 
One thing to remember is that a Dremel will want to jump out of its groove and run along the work surface, dining and gouging it up the whole way.

Be Very careful using a dremel...
I have quite a few tools (belt sander, drill press, grinders, welder, angle grinders and others) but I only use my Dremel for a few things.
 
I have had several Dremels in my life among lots and lots of more hardcore metal working tools.

aaaahhhhhDn'O

I'm thinking taking a Dremel to a ? large ? ish? hardened steel knife is going to be a pretty frustrating and drawn out experience.

I mean . . . I had one from way back in the day (1970's ), when they were more robust than they are now, that I bought new, and just cutting a little slot one inch by 1/4 inch in the bottom edge of a car bumper . . . which is by no stretch of the imagination hard material (mild steel) using abrasive cutoff wheels. . . I was very careful and I still had the Dremel so hot it was a little much to hold onto and by the time I was done it was smoking a little. I would let it run and cool a while and then cut some more. I didn't burn it up . . . and it kept working for another 20 years or so . . .
I'm just saying . . . I have taken them to the max of their ability . . .

Get an angle grinder or a belt sander or power buffer or all three. Save the Dremel for little model things from wood or plastic or super light metal.
No . . . really . . .

For instance cutting the slot in this pocket clip was a perfectly doable job for the Dremel


Grinding any significant metal off of . . . or polishing the whole surface of this hardened blade would just be a fantasy.

 
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Thanks so much for all the info fellas, I really appreciate it. I think I should make myself more clear. The knife is more or less complete. I don't have pictures to show you, but this is what needs to be done. He had put this project on hold because he was waiting on a specific pair of grips he had ordered to come in. And at this point, I'm not even sure if he ordered them, was waiting for them, or what not. He did show me what he was doing. The knife is about 11" in overall length, the blade and the handle are one...it's a fixed knife. Where the base of the blade begins, there is part of the metal that has been colored in with a black sharpie marker, he had told me that he has to remove this extra metal, polish it, so that the scales slip right on. There are holes drilled into the metal, I assume the holes are there to put the scales on to the knife. I'll get to that bridge when it's time to cross it.

I know nothing about a dremel, I know how it works....I've seen them work, I know what they can do...but I have never used one. What I would like to do is rather simple. There is about a 1 or so inch mark that is about 1/4" thick that has to be removed from the knife. From what I was told, the scales will than just slide onto the blade and the knife is more or less complete. I looked at some of the other knives he made and I am going to follow how he put the scales on by looking at the other knives. But like I said, first things first. I have to remove this small piece of metal from the blade, it's not perfectly straight...I have to cut a small curve on the base. He told me he was going to use a dremel, he even took a sharpie marker and drew on the knife what parts of the metal have to be taken off. So with that said, what pieces do I use for the job??

In other words, what kind of demel bits will I need? I know I will need something to cut a straight line, I will need something that can cut curves/angles, and lastly, I will need a bit of some sort to polish so that it is smooth with no sharp edges. I wish there was a video that would show this....there probably is, I just can't find it. And after I remove the metal that is indicated on the base of the blade, I can start to worry about the scales later on. But I do recall him saying that his next step was to remove the metal filled in with the magic marker. So...that's what I'm going to try and do. And if I mess up, it won't be the end of the world...the scales will be covering it up. Still...would like to know how to use a dremel right. I have one of those dremel kits that have like 50 different bits. Is there a specific video you guys can point me to? I'm more concerned with the part that calls for the curve...that looks like the most challenging part for me. And next month when I see my uncle, he can help me with the scales. Thanks guys!!
 
Hey DrtyHarry, I think it is super cool that you want to take up where your Grandfather left off with the knife. I would suggest that you make a knife or two starting from scratch. That way you will have a much better understanding of what needs to be done with your Grandfathers knife. It would be a shame if you ruined a knife that obviously means a lot to you. Btw, a dremel is just about the last tool in the world I would want to use for what you are describing. I recommend simple hand tools like good quality files and a hacksaw and maybe a coping saw.
Also even a cell phone pic would enable us to help you much better.
 
There are a whole lot of things in this world that I am not worth a rink at but . . .
Well it may sound smarmy but I was born knowing how to use the hand grinder. I don't know how else to say it. I can't tell you how. Practice before you tackle the knife. Get a face shield not just eye goggles.

Maybe these links and suggestions will help.

https://www.dremel.com/en-us/customerservice/productsupport/gettingstarted/Pages/default.aspx

Learn the two handed grip but I just hold my thumb on my non dominate hand against the side of the grinder near the tool bit end with the bottom of my hand or other fingers splayed out on the surface to gain control and prevent the running across the surface problem that some one mentioned.
https://www.youtube.com/watch?v=9iMiH8wYTDY

Looks like there are a number of youtubes.

and finally . . . Buy a real grinder like this at least

https://www.youtube.com/watch?v=Zeq8bqkM2Ek

https://www.youtube.com/watch?v=wLV7QpmzFOA
 
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OK...since I don't have the knife with me I can't take a pic, but I made a rough sketch of what I need to do. The left part has been done, the places that look like sharp corners are not super sharp, they are smooth. In the pic....the part on the right that is in solid black needs to come off, it's not just a straight cut....so I thought perhaps there was a tool for cutting metal with a dremel that has a few curves or bends to it. Pardon my lousy sketch....

149tsj.jpg
 
WOWBAGGER....I couldn't in a million years do any of that stuff!! All I am trying to do is get rid of some metal from a practically finished knife and don't want to leave super sharp edges. I don't know the type of steel...I do know that it is VERY strong stuff, I want to say S90V or S110V maybe D2 or 154CM. Not sure. I just want get rid of the black portion of the drawing. I guess I could use a file...I assumed a dremel would work since my grandfather said it would take him 5-10 mins to finish with a dremel.
 
But like I said, the lines are not straight...there are small sharp curves. Shall I use files instead??
 
OK...are there a particular type of files that I should look for? Shall I look into any sand paper as well? The blade has a very nice and clean satin finish. And as for the hack saw, I take it I would need a blade suited for metal. And as for the small angles and curves, are you suggesting I use the files to achieve that? Sorry for the noob questions...thanks so much!!!
 
Harry,
Do yourself and us a favor - fill out your profile. If we knew a bit about you like age, location, occupation/student, etc. we could help more. The best solution would be for a local maker to offer you a visit where the two of you could properly finish the blade and guard.

95% of most knife work can be done by files and a hacksaw. The rest can be done with sandpaper. It is slow work sometimes, but the results can be quite good if you take your time. The least used tool would be a Dremel.
 
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