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  • Homemade Tool and Cutter Grinder

    I need a longer term project. Lots of short term quickies, but I need something that will keep me busy for a while.

    Quite often I need something ground, I don't generally need any type of "precision", just a quick touchup, or a custom tool of some sort. None of it is working at aerospace tolerances.

    I'm considering the quorn, but have heard a lot of complaints about it in the past. I am not going to buy the castings, but do most of it out of aluminum because I can get it cheap from the scrapyard.

    Any thoughts?

  • #2
    JBD Willis has redesigned the original Quorn around building from stock and incorporated some changes to the design. You might look for the drawings and his rationale for the changes he made as you consider options. In the files section of http://groups.yahoo.com/group/quorn_owners you can find the Bonelle stuff. The group discussions might also have some ideas about what has worked, what hasn't, what's been problematical etc.
    .
    "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill

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    • #3
      http://bbs.homeshopmachinist.net/sho...0&postcount=88

      did just what you're talking about a couple of years ago!

      Bob

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      • #4
        Yes you did! Would you mind shooting a couple more pictures of it?

        Thanks for the link, I'll check it out over the weekend.

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        • #5
          Would you mind shooting a couple more pictures of it?
          Oh yes, please do Bob!! Lane and I both admired that little grinder when you posted it. Love to get a few more pics and maybe some comments on how you come up with it , what it'll handle, spindle, collets, etc, etc, etc....
          If everything seems to be going well, you have obviously overlooked something........

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          • #6
            Bob also can you tell me Little about the horizontal band saw did you build that? what the cutting capacity of it thanks for your time Bill.

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            • #7
              Originally posted by Bill Pace
              Oh yes, please do Bob!! Lane and I both admired that little grinder when you posted it. Love to get a few more pics and maybe some comments on how you come up with it , what it'll handle, spindle, collets, etc, etc, etc....
              Same here.

              Nice job on the TC grinder.

              Nice job on ALL the tools.

              TMT

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              • #8
                Bob,

                Excellent job on the home built machines. All I can say is more, more, more.

                Brian
                OPEN EYES, OPEN EARS, OPEN MIND

                THINK HARDER

                BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

                MY NAME IS BRIAN AND I AM A TOOLOHOLIC

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                • #9
                  Thanks for all the kind words, guys!

                  Having owned and rebuilt a Cincy #1 1/2 (yeah a 1 1/2! pat ~1909 IIRC) I always regretted selling it. One day going thru my junk, er treasures, I ran across some THK HSR15 linear brgs that were lightly used surplus and the idea struck me to build a small grinder. I wanted it to be not too much bigger than a Cuttermaster, but more versatile. After designing and building the grinder and the initial tooling (workhead with air bearing spindle), it became a work in progress so that now I've got fixtures and tooling to sharpen just about everything I need to sharpen, including endmills, reamers, counterbores, sf countersinks, even bandsaw blades. Let me post a couple more pics (I think theres a limit/post?) and then you guys ask if theres something in particular you want to see.
                  Grinder basic specs:
                  motor: 3/4 hp 3450rpm 3L drive to spindle
                  Spindle: 7204 ang contact ball brg 3 in/ft taper for wheel adapters. tilts + and - 30 degrees.
                  Table travel 10 in by 10 in. X is by .035 aircraft cable (zero backlash), Y is via 1/2-10 acme leadscrew.


                  BillC, you asked about the horizontal bandsaw. Let' see:

                  Capacity: 9 in. round @90 deg., will miter 6 in sch40 pipe @45 deg. (~6.5), 10 inch flat.
                  Blade speed 0-160 fpm
                  Blade size 1/2 x 92 (bimetal 10/14 mostly)
                  Swivel: 0-60 degrees.
                  Mist coolant (mostly never used!)
                  Quick switch to vertical

                  This is about the fourth horizontal I've built, and I thought the last, but I've kinda got the urge to do one more before I get too d**ned old to sling the iron around. I don't know why more hobbyists don't do their own saws--It's a great learning experience and basic skill builder and heck, you need a saw anyway!

                  Pics:










                  Better not push my luck! Had 7 images up but it told me I was limited to 4!

                  Bob

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                  • #10
                    You can just post a second reply with the rest of the images.

                    Very nice work!

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                    • #11
                      Snowman, you're out in the "rust belt", should be lots of auctions going on. Why not pick up a KO Lee, Cinci, etc. tool and cutter grinder? Just build whatever tool holding accessories you need.

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                      • #12
                        Don't have the room for another floor planted machine. I've got a small amount of bench space available for such a tool though.

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                        • #13
                          The bench mounted ones are around. One was at auction over here just last month. It was attached to a cast metal stand but many of the little ones can be removed from the stand and mounted to a bench, this one could be changed over.

                          If you really want to make one then cool. But if your willing to purchase, look around you may find one.

                          rock~
                          Civil engineers build targets, Mechanical engineers build weapons.

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                          • #14
                            I've been thinking about the same thing and have even started a bit. I also don't have room for a floor machine and want a relatively small, bench top one.

                            One of the first things I considered is that there are two basic motions for the cutter that you need while sharpening it; lateral or left-right linear motion and rotional motion. The air bearing is usually used to provide both of these at once to allow the helical edge of a cutter to be brought smoothly across the wheel. It seems to me that an air bearing is needed because of this simultaneous, dual motion: linear and rotional. But this is not necessary as the two motions could be separated, linear ball bearings could be used for the linear motion and standard radial ball bearings for the rotational motion. It seems that this separation would provide smooth operation in both cases. Alignment would be critical as any angular difference in the axies would produce a tapered tool. Again, that could be a plus for some tools. I don't have any evidence that this would work, but I am anxious to test it out.

                            Of course, you also need an infeed, but that can be a standard feed arangement using dovetail slides and a regular lead screw as it is not used during the actual grinding pass and can be locked down.

                            I am also worried about keeping the grit out of things. An air bearing is almost self cleaning in that it would tend to blow the grit away from the bearing surfaces. But linear and radial ball bearings would not be, so some kind of protection is needed. Any ideas/suggestions here would be nice. And yes, I am aware of boots. I even downloaded some instructions for rolling your own from a camera building site.

                            Another big area of concern is the tool holding system. You really need collets but that can be big bucks. Especially if you want to be able to hold tools with shanks up to 3/4" or 1" or even larger. I have tossed some ideas around in my head and on a sketch pad, but haven't decided on anything yet. I am assuming that there are no chucks available that would cost less than a full set of collets and that would be accurate enough for this purpose. One idea I have had was to start with a built in, dedicated collet at about 1.25" ID and add slotted sleeves to bring it down to the tool's shank size. These sleeves would be simple cylinders with a concentric hole: easy to make on the lathe. You could make the sleeves yourself using a slotting design like the ER collets have so that each one would cover a range of sizes. So a handfull (16 to 18) of shop made sleeves would cover a range of say 1/4" to 1". Perhaps a double sleeve system could be used for smaller sizes: say one to bring it down to perhaps 3/8" and a smaller one for the actual size. Not really sure how well this would work. Or a second full sized collet to fit the original spindle and it would have the 3/8" bore size to hold the smaller sleeves. This sounds like it would have less run out. That's a lot of sleeves, but you could make them as needed. Another possibility for the smaller shank sizes would be to make a stub holder for some small ER collets. I have a set of ER-11s that cover up to about 1/4" so that might work. Again, any ideas or suggestions would be nice.
                            Paul A.
                            SE Texas

                            Make it fit.
                            You can't win and there IS a penalty for trying!

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                            • #15
                              Bob,

                              Do you have any closeup pics of your spindle?

                              -Jacob

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