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  1. #211
    Join Date
    Dec 2007
    Location
    Adelaide
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    574

    Default

    Here is a pic of the Bonelle grinding spindle - it's pretty much a copy of the Quorn spindle, bearings are magneto angular contact types with spring preload reportedly good for 20K rpm, the bearings are not too pricey I think around AU$14 ea. Not sure but I think the internal taper suits an 8mm collet, a drawbar through the middle of the spindle secures the wheel mounted on the boss that locates on the taper. I made my spindle shaft from an old centre fire rifle barrel I picked up at a gun show specifically to use for the shaft - good quality high tensile steel already with a hole through the middle.I have all of the dimensioned drawings, PM and I'll send them to you if you want.
    Attached Images Attached Images

  2. #212
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default Grinding spindles

    A quick bleat on spindles.
    I have the Workshop Practice Series book no 27 by Harprit Sandhu. It describes several spindle types and sizes including drawings. Other info covers mounting the housings and driving the shafts. It is worth a look as all the thinking is already done and the drawings have dimensions.
    Regards
    BC

  3. #213
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Neevo,

    Quote Originally Posted by neevo View Post
    Have you thought about toothed belts to drive it? I have some of these on their way from China for my bandsaw reduction drive. They would be perfect I’d imagine if they are as I expect.

    Yes that is the sort of thing that I was looking at. Where/who have you ordered yours from ?
    Thanks.
    Best Regards:
    Baron J.

  4. #214
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Steve,

    Quote Originally Posted by OxxAndBert View Post
    Hi John.
    I've probably misinterpreted the drawing, but what locates the shaft axially? Are you just relying on a press fit of the bearings to the shaft since there's no shoulder on the shaft?
    Is then intent of the inner spacer at one end and outer at the other to be able to adjust preload?

    Steve
    The drawing at the moment is just Ideas. I was thinking along the lines of the shaft being captive at one end and the bearings being captive at the other. This would allow the shaft to expand if it got hot. I've tried to find drawings on line, but all I seem to get is people selling expensive kit.

    I was thinking that a ring bonded onto the shaft would work, then I could use a length of drill rod for the shaft. I've also a number of printer shafts as well that are 1/2" inch diameter, surprisingly non are 12 mm diameter.
    Best Regards:
    Baron J.

  5. #215
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Familyguy,

    Quote Originally Posted by familyguy View Post
    Here is a pic of the Bonelle grinding spindle - it's pretty much a copy of the Quorn spindle, bearings are magneto angular contact types with spring preload reportedly good for 20K rpm, the bearings are not too pricey I think around AU$14 ea. Not sure but I think the internal taper suits an 8mm collet, a drawbar through the middle of the spindle secures the wheel mounted on the boss that locates on the taper. I made my spindle shaft from an old centre fire rifle barrel I picked up at a gun show specifically to use for the shaft - good quality high tensile steel already with a hole through the middle.I have all of the dimensioned drawings, PM and I'll send them to you if you want.
    Thankyou for that offer, it would be much appreciated. I'll PM in a moment.
    Best Regards:
    Baron J.

  6. #216
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Guys,

    Thankyou all for your comments, they are appreciated. Particularly as I'm struggling a bit at the moment, what with this Cov19 thing. They have closed the surgery down the road and said that we now have to travel about five miles to the main one to collect our prescriptions, but they have put a big notice on the door not to enter for any reason.

    Its becoming a farce, I'm sure that they are just using cov19 as an excuse, trying to close our local surgery. They have been cutting back for over 18 months now. It used to be open ten hours a day, six days a week ! Up to this week it had been reduced to 2 hours for one afternoon twice a week. A lot of the folks round here are aged and infirm, only a few have there own transport. The bus service is every two hours and doesn't run after 6 pm. So if you don't catch that last one it is an expensive taxi ride.

    Sorry if I'm ranting, its getting frustrating.
    Best Regards:
    Baron J.

  7. #217
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    666

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Neevo,



    Yes that is the sort of thing that I was looking at. Where/who have you ordered yours from ?
    Thanks.
    Shuangjianli on eBay. You can get smaller too but I bought 15mm width. I think it’s also available in 10 or 11mm I think.

  8. #218
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Neevo,

    Whilst I can find Shuangjianli on eBay. I cannot get to see any products or even get to see their shop. Weird.
    I've found that there are several suppliers on Aliexpress.

    Thanks anyway.
    Best Regards:
    Baron J.

  9. #219
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi BC,

    Quote Originally Posted by steamloco1954 View Post
    A quick bleat on spindles.
    I have the Workshop Practice Series book no 27 by Harprit Sandhu. It describes several spindle types and sizes including drawings. Other info covers mounting the housings and driving the shafts. It is worth a look as all the thinking is already done and the drawings have dimensions.
    Regards
    BC
    Thanks for the pointer ! I got a copy of the book No: 27 yesterday from a friend who had it on his bookshelf. I've only had a quick glance through it, but it seems very comprehensive.
    Best Regards:
    Baron J.

  10. #220
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    The Workshop Practice Series is readily available online in PDF format too.
    Here's a link to internet archive with the whole series: https://archive.org/details/Workshop...eries/mode/2up

    Steve

  11. #221
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    666

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Neevo,

    Whilst I can find Shuangjianli on eBay. I cannot get to see any products or even get to see their shop. Weird.
    I've found that there are several suppliers on Aliexpress.

    Thanks anyway.
    Odd maybe is an Australia/uk thing? Plenty of other suppliers out of China as you’ve found. 3M is loads for what you need I reckon. It might be a bit light for my needs but well soon find out.

  12. #222
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Thumbs up Simple Grinding Spindle, -2

    Hi Guys,

    I've been having a read at the publication I was pointed to by Steamloco1954, thanks BC. Now having a better Idea of what I need to do to make a cartridge grinding spindle, have started to do drawings of the individual parts that are needed. I've still based the design on the 6801ZZ bearings that I mentioned originally and I will start to collect some materials to make it.

    Spindle Design 2.png
    In this drawing the important bit is the retaining nut that fits into the housing behind the grinding wheel. The part on the left is a representation of the wheel end of the cartridge showing where the retaining nut fits. I've chosen 32 threads per inch using a 60 degree threading tool bit, as the means of fastening the nut. Since carbide threading inserts are cheap and easily available.

    I normally try to thread away from the chuck with the lathe running in reverse, which works very well. I've also chosen a thread pitch which is a multiple of eight, which is the pitch of the leadscrew on my Myford lathe so the half nuts can be closed at any point. I don't have a threading indicator.

    Since I don't yet have the material for the cartridge housing I will be leaving the threading until I can machine that piece.


    Thoughts or suggestions welcome, thanks for looking !

    Thanks guys.
    Best Regards:
    Baron J.

  13. #223
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    You'll need some method of locking the securing ring once you get the correct preload on the bearings.
    I haven't dealt with grinding spindles, but in general the hassle with setting preloads is often the method of locking the adjuster actually affects the preload. An example is the use of a double nut - one to set the preload, and the other to lock the first nut. Tightening up the locknut always increases the preload as it pushes the setting nut to the other side of the thread groove. The larger the clearance in the thread the more pronounced the preload change. A lock that positively locates the adjuster without placing any force on it is the best way IMO.

    A labyrinth seal arrangement along the lines of the ones on the drawing Familyguy posted would be good to incorporate.

    Also a way to locate the shaft axially. I'd just press the spacing sleeve on to achieve that.

    Steve

  14. #224
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default

    Hi Steve,

    Thankyou for your notes.

    I haven't acquired much by way of materials for this spindle yet and I'm dubious at the moment about ordering the bearings from China, since stuff I ordered nearly seven weeks ago via Banggood hasn't turned up. I looked at the bearings on Aliexpress, now Aliexpress keep Emailing me to place the order for the stuff that I've only looked at.

    I do have a length of 12 mm precision ground rod that I would like to use for the shaft and a length of 40 mm leaded steel bar, EN1L or something like that, to use for the housing. I've thought of just slicing some 12 mm thick discs of the end of that to use to make the end caps.

    So at the moment it is very much what have I got and how can I do that to get to where I want to be. I'll keep doing the drawings as I go along until I get a finished item. I'll incorporate the labyrinth seal into the drawing. As far as pre-loading is concerned, I have some sample Belleville washers, they aren’t the right size, but I can ask for some that are. I think that they would work nicely and avoid problems with adjusting mechanisms.
    Best Regards:
    Baron J.

  15. #225
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

    Default Simple Grinding Spindle, -2a

    Hi Guys,

    Based on suggestions I've re-done a drawing of the spindle end cap showing modified dimensions and a labyrinth dust trap. At this moment in time this is the final drawing of this part.

    Spindle Design 2a.png

    Material free machining steel.

    I'll post other parts drawings as I do them and at some point collate them.

    Thanks for looking.
    Best Regards:
    Baron J.

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