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Thread: Brooks TC Grinder.
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27th Mar 2020, 10:39 AM #211Golden Member
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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.
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27th Mar 2020, 11:47 AM #212Senior Member
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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
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27th Mar 2020, 06:24 PM #213
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27th Mar 2020, 06:34 PM #214
Hi 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.
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27th Mar 2020, 06:38 PM #215
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27th Mar 2020, 06:55 PM #216
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.
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27th Mar 2020, 09:15 PM #217Golden Member
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29th Mar 2020, 07:48 PM #218
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.
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29th Mar 2020, 07:52 PM #219
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29th Mar 2020, 09:34 PM #220Most Valued Member
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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
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29th Mar 2020, 09:50 PM #221Golden Member
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31st Mar 2020, 04:00 AM #222
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.
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31st Mar 2020, 04:47 PM #223Most Valued Member
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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
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31st Mar 2020, 07:08 PM #224
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.
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1st Apr 2020, 01:12 AM #225
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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