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Thread: Home built toolpost grinders
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26th Jul 2020, 09:37 PM #31Golden Member
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Nice work finding the bearings BC, does the dealer in the US specialize in bearings? I have been looking for some obsolete bearings, for the spindle of my Beaver milling machine, without luck in Australia and England.
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26th Jul 2020, 09:47 PM #32Most Valued Member
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It is an interesting option, might even scrape in under the 22Kg limit for a complete TPG. I'll look into it some more.
On one han, I like to deal with Australians, but I have to say that the Americans generally leave us for dead when it comes to helpfulness and professionalism.
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27th Jul 2020, 08:24 AM #33Senior Member
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Bearings
Hello Techo 1.
These bearings came from central surplus. Welcome to Central Surplus NY. They have a large range of industrial products. From memory I also searched Fleabay USA. Some of the bearing numbers may have a different prefix, the first few letters might be different. Be careful with the description. It seems to be a big industry over there.
Regards
BC
You can always have close size bearings ground or machined.
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27th Jul 2020, 08:30 AM #34Senior Member
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Tool post grinder
SAM_0667.jpgHi from the old goat.
Here is the pic of my Cinci T & C internal spindle. The cartridge diameter is 2" ans the spindle extension is 3" to the end of the collet. The collet nut is knurled.
Regards
BC
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27th Jul 2020, 03:45 PM #35I break stuff...
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Stefan Gotteswinter just put out a video on threadmilling on a lathe (https://www.youtube.com/watch?v=6_1Nlf-X4bw)...
He used a high precision router which takes ER16 collets, and just made a clamp to hold it in the toolpost.
Seemed like the router he used would meet most of the requirements for a TPG. Good range of speeds (5,000 to 25,000), decent enough power at 1050watt, and with a quoted runout of less than 0.01mm, possibly as accurate as needed for a TPG?
A quick search for the Kress FME-P ,and it looks like they're available here for about $750 (https://www.mytoolstore.com.au/produ...g-Spindle.html).
Not completely horrendous, and you might find a deal somewhere on one. The big advantage to my mind is that it runs ER16 collets, and can be removed from the adaptor very quickly, meaning it could be used for any number of other purposes as well. Maybe a bracket for the mill to run tiny drill bits, or small carbide endmills/router bits?
Just thought it was an interesting take. Might not be exactly cheap, but a much quicker build, somewhat more compact, and much more flexible. I reckon I'd struggle to scrounge up enough bits to build a dedicated TPG for considerably less than that, I don't think I've got any steel in the right size, nor bearings good enough, or a motor etc....
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27th Jul 2020, 07:47 PM #36Golden Member
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28th Jul 2020, 09:30 PM #37Diamond Member
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Making a tool post grinder is something that I looked at doing years ago, but never got around to it. You do see Waldown Tool Post Grinder come up on eBay from time to time, but they tend to go for a fair bit. I just bought some plans of eBay the other day for making a tool post grinder https://www.ebay.com.au/itm/Tool-Pos...rdt=true&rt=nc I had actually posted the plans on Woodwork Forum at the time, but the plans weren't complete. The partial plans that I have do talk about castings, but I believe that the grinder should be able to be fabricated. If anyone is interested I will scan the plans and share them.
All The Best steran50 Stewart
The shortest way to do many things is to do only one thing at once.
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28th Jul 2020, 11:21 PM #38Most Valued Member
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8th Aug 2020, 08:05 PM #39
Home Built Brushless toolpost grinder/die grinder finished!
I finally assembled my "super Dremel" today and used it.
I'm stoked! It is literally unstoppable.
I used it with a carbide burr to clean up some steel welds in internal corners (in my welder foot pedal - thread coming!)
I deliberately tried to stall it at various rpm - that just resulted in a small reduction in rpm and deeper cuts. Eventually the carbide burr broke in half.
Neither the motor nor the speed controller mounted in the handle got noticeably warm. So I'm calling that a success.
I'll report on the lifespan of the bearings ass and when I find issues. I haven't replaced the single row bearings with angular contact bearings yet, as they haven't arrived yet.
I'm also still to 3-D print a cable connector for the Ryobi 18V 5A battery that I'm using at the other end of a 1m long fat cable.
The 20 minuted torture test of the motor and burr didn't appreciably reduce the battery charge, so this is quite efficient I'd say.
From the last update above, I finished machining the "handle" which houses the 80A speed controller (ESC) and the "servo tester" which I'm using to vary the speed. When that was finished and the edges radiused, it looked so 'nice', I decided to have a go at anodising it!
IMG_20200807_222051_9.jpg IMG_20200808_000937_7~01.jpg IMG_20200808_173148_4~01.jpgCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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8th Aug 2020, 09:43 PM #40
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9th Aug 2020, 12:59 AM #41Could you do a thread on it with details of motor electronics etc please.
I could, but the variables of motors and ESC don't make that sensible. Electrically, the three motor leads are connected (in my case soldered) to the 3 input leads of the ESC and the radio plug from the ESC is pugged into the servo tester. The two power cables from the ESC and connected to a power supply - in my case a cordless drill battery. That's it.
Mechanically, as already described, I replaced the end shield of the motor with a new one which has mounting holes for the handle. The 'carving' inside the handle was designed to fit the ESC I bought and the servo tester. I recessed the servo tester knob so it was below flush of the handle so it can't accidentally be changed or be bumped so easily. I didn't want the battery mounted on the end of the handle so I added a meter of cable between the battery and the handpiece.
I think you would have to design your own to suit a motor and ESC and available tools and materials....
My next move will be to design and fabricate an too holder for it (bolted to the mounting holes of the motor's front end shield) to suit my lathe tool post. Again, that will have to vary to suit each person's lathe....Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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9th Aug 2020, 07:32 AM #42Most Valued Member
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Obviously not as much as you Rob, so do me a favor m8 put your kmart TPG on your greatest lathe in the world and see if you can finish grind a 60mm long bore .750" dia + or - .0002" in hardened 4140.
Oh hey.....buddy....do you have something to measure it with?[/QUOTE]
how do you measure that? twice
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9th Aug 2020, 10:47 AM #43Most Valued Member
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9th Aug 2020, 03:24 PM #44
Hi Arron,
Nice to hear from you.
I will mostly use it for die grinding aluminium welding repairs and fabrications.
But it's there for TPgrinding when needed.
Cheers
JoeCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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23rd Aug 2020, 11:26 AM #45Diamond Member
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Just an update on the Tool Post Grinder Plans that I ordered. I just checked the tracking for them and they were delivered to a Postal Agent in Perth on the 5th August so hopefully their not too far away. Once I receive them I will scan them and upload them.
All The Best steran50 Stewart
The shortest way to do many things is to do only one thing at once.
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