Page 31 of 31 FirstFirst ... 21262728293031
Results 451 to 459 of 459
  1. #451
    Join Date
    Apr 2012
    Location
    Healesville
    Posts
    1,762

    Default

    You might have a couple of bugs to sort out yet but a very nice machine John....well done m8

  2. #452
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    345

    Default

    I've got a 1.6 cut off wheel mounted on an arbour, so once the sharpening is done I can swap over to the cut off wheel and gash the end if I need to, on really small cutters (I've done 1/8") I hold the cutter in the vice and use the dremmel under a large magnifying glass.

  3. #453
    Join Date
    Aug 2010
    Location
    Near Bendigo, Victoria, AUS
    Age
    69
    Posts
    2,893

    Default

    @ familyguy: you can also get 1.0 and 0.8mm cut-off wheels in some sizes (100mm dia I think). I was surprised to see that and thought I might make a special arbor for a thin blade like that for my T&C grinder.
    Cheers, Joe
    retired - less energy, more time to contemplate projects and more shed time....

  4. #454
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    345

    Default

    Quote Originally Posted by jhovel View Post
    @ familyguy: you can also get 1.0 and 0.8mm cut-off wheels in some sizes (100mm dia I think). I was surprised to see that and thought I might make a special arbor for a thin blade like that for my T&C grinder.
    I saw a youtube video where a guy put the gash in by hand with an angle grinder, so I thought why not use one of my spare arbors, what I really need though is to make an air bearing indexing cutter holder so I can also do the flutes, it is fine to sharpen just the teeth and I've found that usually this is ok, but the flutes also do some of the cutting so they will eventually need attention.

  5. #455
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    4,789

    Thumbs up Collet Indexing !

    Hi Guys,

    Today is the first chance that I have had to be able to do anything on the Brooks TCG for a little while.
    Sorry for the delay in getting on with it !

    I was having problems with the index finger not having the rigidity to accurately repeat the position of the tool when grinding the ends of the flutes. I had already made a stop ring that clamped to the collet shaft, so rather than make another ring I used it to index the collet in four places by drilling holes that would take a peg and provide four positively located positions.

    Unfortunately I didn't have any brass bar stock that was of a suitable size, but I do have several "Yale" Lock barrels that are made from brass. A little time with the bandsaw produced a suitable piece.

    22-06-2021-005.jpg

    The piece on the right is the original "Yale barrel, the piece on the left is the bit of brass that it contained. The holes down its length are convenient since I need two of them for screws to fasten it to the collet holder body.

    22-06-2021-002.jpg

    This picture shows the collet holder along with the indexing ring. The cap screw securing the pin guide block is M4. A second cap screw will be fitted where the red dot is. The silver thumb screw is going to be replaced by a grub screw because the thumb screw will not clear the surface that the collet holder is fitted to. In the picture I've used a short length of 20 mm precision ground bar instead of the collet for the purpose of setting up the pin guide block for position and marking the holes for the screws.

    22-06-2021-001.jpg 22-06-2021-004.jpg 22-06-2021-003.jpg

    These three pictures show how the pin guide locates into the index ring. Also note the gap between the ring and the face of the collet holder. This is to allow the tool in the collet to be withdrawn enough for it to be rotated without catching the next tool face to catch the grinding wheel. The index ring already had the recess in it when made, since it fits over the collet head it doesn't cause any problem. The threaded hole was where the original stop adjuster was fitted.

    I'll take some more pictures when I've got this ready to use.

    Thanks for looking Guys, your support is very much appreciated.
    Best Regards:
    Baron J.

  6. #456
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    345

    Default

    Nice job, just wondering why you would use a finger rest if you have a method of indexing the tool holder, if the cutter teeth are evenly spaced then once the first tooth is set up for grinding the others just follow when you index the tool holder via the indexing holes, I was under the impression that a finger rest was used for shell type cutters and slit saws etc that have multiple teeth.

  7. #457
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    4,789

    Default

    Hi FamilyGuy,

    Thank you for your post !

    Quote Originally Posted by familyguy View Post
    Nice job, just wondering why you would use a finger rest if you have a method of indexing the tool holder, if the cutter teeth are evenly spaced then once the first tooth is set up for grinding the others just follow when you index the tool holder via the indexing holes, I was under the impression that a finger rest was used for shell type cutters and slit saws etc that have multiple teeth.
    I made and fitted a finger rest but found it too flimsy to accurately repeat on each tooth. That is why I made the index pin arrangement shown in the pictures. Once the first tooth is set up then the others will follow. This accuracy is needed so that when grinding the primary facet its square to the secondary one.

    The finger rest will be OK for grinding the flutes since there will not be any force on it, all it will have to do is follow the flute as the cutter is moved back.
    Best Regards:
    Baron J.

  8. #458
    Join Date
    Dec 2007
    Location
    Adelaide
    Posts
    345

    Default

    It seems to me that the general consensus seems to be that an air bearing spindle is the way to go when it comes to sharpening flutes - the spiral flutes on milling cutters are actually a very coarse thread, and when trying to keep the flute in contact with the tooth rest and at the same time pushing it forward, friction is the enemy - I have tried it, my Quorn casting kit came with some castings that when setup could produce ground threads and also sharpen flutes, reamers, taps etc. it is doable but not that easy. After seeing an air bearing setup in action on a youtube video I decided that I would wait until I made such a setup myself before trying to sharpen flutes.

  9. #459
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    4,789

    Default

    Hi Familyguy,

    Whilst an air bearing is preferable and a very nice thing to have, the cutter being ground is not pushed towards the wheel but pulled back away from the wheel. The last thing you want is to crash the end of the cutter into the wheel.

    Remember that you are only taking tenths of a thou off in order to touch up the blunt edge ! The same with a tap, though you could do those with a round stone by hand unless they are badly chipped in which case grinding them with a wheel might be better.
    Best Regards:
    Baron J.

Page 31 of 31 FirstFirst ... 21262728293031

Similar Threads

  1. Hercus tool and cutter grinder & cylindrical grinder.
    By stix012 in forum EBAY, GUMTREE, and other off forum sales sites
    Replies: 1
    Last Post: 23rd Aug 2018, 05:31 PM
  2. Heald internal grinder & Heald Planetary grinder
    By achjimmy in forum METALWORK - Machinery, Equipment, MARKET
    Replies: 2
    Last Post: 11th Oct 2017, 09:22 PM
  3. New to me old grinder.
    By DSEL74 in forum ANTIQUE AND VINTAGE MACHINERY
    Replies: 12
    Last Post: 30th Sep 2016, 08:35 PM
  4. Roller grinder ways/ plain grinder ways
    By Michael G in forum METALWORK GENERAL
    Replies: 11
    Last Post: 6th May 2012, 12:37 AM
  5. Anyone used this Grinder?
    By bwal74 in forum METALWORK GENERAL
    Replies: 6
    Last Post: 10th Apr 2012, 07:47 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •