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Torque Needed to Drive a Grinding Stone

04/02/2012 10:26 PM

hi,

I need to know how to calculate torque needed fora grinding stone to remove burr in a hole(about 10mm). i am going to use a cone shaped grinding stone, thats is slightly bigger than the hole dia.to operate the stone i am going to fix mini motor. but i dont know how to calc the torque needed for the motor to drive the stone for effective burr removal.. Can anybody suggest???

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#1

Re: Torque needed to drive a grinding stone

04/02/2012 10:37 PM

Need to know a lot more.

The hole is in what?

The stone is how course?

Feed rate?

Lubricant?

Both sides, or one?

Twenty questions anyone?

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#3
In reply to #1

Re: Torque needed to drive a grinding stone

04/02/2012 10:51 PM

the hole is in a 5" pipe. the deburring is in internal surface. stone is 24grit. no feed and lub, because its just deburring only not even chamfering. the burrs should be removed thats all we need. only inside, outside we use sanding belt. so no prob.

anything you want pls reply..

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#4
In reply to #3

Re: Torque needed to drive a grinding stone

04/02/2012 10:54 PM

Then buy a commercial grinder and don't try to put useless obstacles in the way, like calculations that will mean nothing.

Just buy good hand tools. Don't complicate things.

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#6
In reply to #4

Re: Torque needed to drive a grinding stone

04/02/2012 10:58 PM

the prob is there are 3500 holes in the pipe. with hand tool we cant do this, it will take a day complete for a single pipe. we are already usng air opereted straight grinder with grinding wheel, but not so effective. this stone we are going to use multiple in numbers with multiple motors attached, so the deburring will be effective.

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#41
In reply to #6

Re: Torque needed to drive a grinding stone

03/15/2021 4:03 AM

It started with <...a...> hole and now there are <...3500...>. Can one really expect reasonable responses to a posting when such fundamentals are withheld from the forum (rhetorical question - NNTR)?

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#43
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Re: Torque needed to drive a grinding stone

03/15/2021 7:58 AM

Nine years later you respond.

The OP hasn't signed on to CR4 for eight years.

At one time CR4 was helpful and attracted people with interesting engineering questions. Now we attract spam and squabble over differences in opinion.

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#5
In reply to #3

Re: Torque needed to drive a grinding stone

04/02/2012 10:55 PM

also the burrs may be 1mm thick..

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#2

Re: Torque needed to drive a grinding stone

04/02/2012 10:40 PM

you need to give us all the specication before we can give you pertinant advise.

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#7

Re: Torque Needed to Drive a Grinding Stone

04/02/2012 11:20 PM

I have a suggestion, or more accurately a question for you, castkarthick. Do you know how to calculate how much torque will be needed to drill a 10mm hole in this mystery material? This will surely require more torque than to de-burr the hole but will be easier to calculate because there will be less random factors like the size, number and angle of the burrs.

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#8
In reply to #7

Re: Torque Needed to Drive a Grinding Stone

04/02/2012 11:41 PM

i dont need that much very accurate number and i am going to use only small mini motor that can fit into a mandrill or tool also can enter into the ID of pipe. so pls give an approx idea or number for torque, then i will search the motor with the number.

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#9
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Re: Torque Needed to Drive a Grinding Stone

04/02/2012 11:47 PM

You want a number but you won't answer my question. Ok, I'll give you a number, 42. That should cover everything.

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#11
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Re: Torque Needed to Drive a Grinding Stone

04/03/2012 12:12 AM

GA from me for the cool reference.

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#14
In reply to #7

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 1:11 AM

the hole size is 10mm, burr thickness is may be 1mm max, mtl of pipe is 13chrome L80 oil and gas pipe. angle i am not sure, just normal burr only,

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#18
In reply to #14

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 2:24 PM

Actually you're still not answering my question here.

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#10

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 12:12 AM

Well, I've used a RotoZip with a small grinding stone (1" diam. ?). It draws 5A max, 120V, at around 30,000RPM, so how much torque does that equate to? Or you could use the same logic with the air grinder you have used.

You haven't said how long the tube is, but if it has 3500 10mm holes in a 5" diam (I'm assuming you meant the 5" was the diameter, not the length), it must be fairly long. I don't see how you are using a straight grinder unless the stone is larger than the grinder body. Are you sure you wouldn't be better off honing the id or using a pull-bore rig?

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#12
In reply to #10

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 1:05 AM

hi, i think in 30000rpm the stone may break. our pipe is 5" dia i already told. and about 12m length. 3500+ holes 10mm dia. we cant use honing i think, boz the honing stone may push the burrs into the holes then we need to poke the hole with round file, it will take a long time. also pull-boring is a boring technic for a long pipes kind products.

we are using straight grinder with grinding wheel which the wheel is bigger than the grinder. we use some slip ring kind of things to make the grinder straight so the whole grinding surface of the wheel will touch the internal surface. but our pipes have little bend. so it is not so effectively removing.

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#13
In reply to #10

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 1:08 AM

also i am going to make a tool for 1 m long with multiple cone shaped grin stones attached. my concern is the wheel should rotate speed and torque enough to remove the burrs, at the same time it should move move up and down to locate in the hole. but abt the locating issue we can discuss later, first i need abt the motor only.

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#15

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 3:31 AM

Hi castkarthick,

It seems like you have the same problem you had back in October 2011.

John

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#16
In reply to #15

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 3:43 AM

yes man,,,same prob but so far i was working with some diff issues. and now i came-up with this new idea, but dont know how to design fully and implement hahahaha...

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#17
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Re: Torque Needed to Drive a Grinding Stone

04/03/2012 3:53 AM

Hi again castkarthick,

Some more information on the "new idea" might get you more help.

The thing with grinding, it's the rpm of the wheel more than the torque.

At 1 meter long it might be difficult to control.

Best regards,

John

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#42
In reply to #16

Re: Torque Needed to Drive a Grinding Stone

03/15/2021 4:05 AM

That would make this one a duplicate posting, then.

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#19

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 4:15 PM

Why not punch your holes instead.

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#26
In reply to #19

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 2:07 AM

pipe may bend..also there are multiple holes.

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#20

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 4:24 PM

I have been sort of watching this. Please forgive me if already discussed, but I didn't see it offered.

Do you have your heart set on these mounted points (cone shaped grinding stone)? What about a drill/reamer? One operation, cleaner hole.

Why the question regarding torque? I'll go back and read the thread in toto. I probably missed something.

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#21
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Re: Torque Needed to Drive a Grinding Stone

04/03/2012 4:31 PM

OMG You mean we should advise them to use the correct tool in the first place instead of answering a misguided question. No, no we can't do that. That will just embarrass or insult them. We might just drive people away then.

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#22
In reply to #21

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 4:50 PM

A veiled reference to the thread authored by bigbugintheointment. I like it.

Yeah... I am getting a vision of what you mean. There just isn't a whole bunch of information swapping going on at this thread. I read through it all, and I am not quite sure what this is all about. I believe your answer of 42 in comment #9 is about the most reasonable so far.

Oh, and lyn said something like keep it simple. Also pretty solid advice here.

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#23
In reply to #22

Re: Torque Needed to Drive a Grinding Stone

04/03/2012 11:16 PM

Its only a 5" pipe so go for the largest motor which will fit down the hole with your grinding tool. You are not going to be able to fit too many kilowatts in the space available.

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#27
In reply to #20

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 2:16 AM

drill/reamer do good. but our m/c is pneumatic control. controlling feed is little difficult, reamer will break easily, also if we control with pr. ctl valve then the production speed will be reduced. need to consider that also. i already tried that.

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#24

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 12:48 AM
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#25
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Re: Torque Needed to Drive a Grinding Stone

04/04/2012 2:02 AM
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#29
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Re: Torque Needed to Drive a Grinding Stone

04/04/2012 3:10 AM

Thanks bubba

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#28
In reply to #24

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 3:08 AM

Thanks for your best suggestion Mr. Scrapper,

but i think we can use this tool separately after once drilling finished. we need to change the drill holder and fix this tool and run,,, right??

I already tried E-Z burr and Huele tool and Yes tools korea. but the feed and speed controlling is the prob in our m/c boz i already told you mine is pnuematic ctl. also its nearly 20yrs old m/c. we are not ready to upgrade to PLC control or servo motor to ctl the feed and speed.

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#30

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 7:19 AM

Would an automotive cylinder hone like this work?

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#32
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Re: Torque Needed to Drive a Grinding Stone

04/04/2012 1:09 PM

Depending on the size of the abrasive balls on the hone, the OP might have to revert to the second design shown. But from where I sit, this would be the most practical solution.

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#33
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Re: Torque Needed to Drive a Grinding Stone

04/04/2012 6:56 PM

I thought so too (post 10), but OP poo-poo'ed the idea - he/she is dead set on some device he is developing for which TORQUE is a key unknown.

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#35
In reply to #30

Re: Torque Needed to Drive a Grinding Stone

04/05/2012 2:37 AM

No Lahhhhhhh... we need to keep this tool in vertical direction only, but our pipe is 12m just think how to stand the pipe vertically. we need to do a big setup for that. we already thought this too. hahahaha

Anyway Thank you so much....

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#38
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Re: Torque Needed to Drive a Grinding Stone

04/05/2012 9:11 AM

How about the horizontal model?

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#39
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Re: Torque Needed to Drive a Grinding Stone

04/05/2012 9:17 AM

That will not work. The tool you have shown is horizontal, and the OP needs a vertical design.

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#31

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 7:22 AM

or this style?

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#36
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Re: Torque Needed to Drive a Grinding Stone

04/05/2012 2:43 AM

Hi Lonster, may i know what is the name of this tool, let me search about this...

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#37
In reply to #31

Re: Torque Needed to Drive a Grinding Stone

04/05/2012 2:45 AM

hi no thx, i found...

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#34

Re: Torque Needed to Drive a Grinding Stone

04/04/2012 7:19 PM

OK, here's what you need.

You need a 1/4 " shaft. On the shaft you will have a cutter/grinder of 9mm dia. by 2mm thick with sleeve above the cutter face of 7mm diameter by 10mm thick.

Hook this onto your drill, whatever, insert it into the 10mm hole, move 7mm sleeve out until it touches the ID of the hole. Spin 'er up and lift the cutter up to be burr the hole. you will need to travel around the whole hole ID.

It's like a router tool to do the inside of a pipe.

Never mind. I've decided to patent this.

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#40
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Re: Torque Needed to Drive a Grinding Stone

04/05/2012 9:18 AM

And the rich get richer.......

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