Calculating Mount Point Speeds

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Calculating Mount Point Speeds

This topic has 8 replies, 5 voices, and was last updated 25 February 2022 at 13:29 by Mike Poole.

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25 February 2022 at 11:12 #587179
William Harvey 1
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@williamharvey1
Hi,

I have been given a selection of mount point grinding tools, which I am using in a Die Grinder.

I am happy with the grinding speeds for my Carbide Burrs an Aluminium Oxide Mount Points. However I have some pink vitrified bonded corundum stones and I am struggling to work out the correct speeds for these.

According to the guy who gave me them they come from Suhner and the company lists them with maximum surface speed of 45 m/sec.

I have tried to convert this to RPM using this tool here, and get a speed 66110 min-1 (whatever that means)

I am grinding Cast Iron.

Can anyone help?
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25 February 2022 at 11:12 #20622
William Harvey 1
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@williamharvey1
A thread to identify the correct speeds to run Mount Point grinding tools
25 February 2022 at 12:03 #587181
Les Jones 1
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@lesjones1
45 m/ sec is 45 x 60 metres per minute = 2700 m/min. One revolution of you grinding wheel is the diameter (D) In metres times π. (π is about 3.142 in case you have forgotten it from when you were at school.)

So the surface speed will π x D x RPM (In metres/min)
So rearranging this RPM = surface speed./(π x D)
So RPM =2700/(π x D)

Les.
25 February 2022 at 12:07 #587182
Anonymous
Posted by William Harvey 1 on 25/02/2022 11:12:30:

…get a speed 66110 min-1 (whatever that means)…

Same as 66110rpm.

Andrew
25 February 2022 at 12:14 #587184
William Harvey 1
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@williamharvey1
Posted by Les Jones 1 on 25/02/2022 12:03:10:

45 m/ sec is 45 x 60 metres per minute = 2700 m/min. One revolution of you grinding wheel is the diameter (D) In metres times π. (π is about 3.142 in case you have forgotten it from when you were at school.)

So the surface speed will π x D x RPM (In metres/min)
So rearranging this RPM = surface speed./(π x D)
So RPM =2700/(π x D)

Les.

Thanks Les – CSE Grade 1 maths, but my brain has suffered a lot of abuse since then
25 February 2022 at 12:17 #587186
William Harvey 1
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@williamharvey1
Posted by Andrew Johnston on 25/02/2022 12:07:40:

Posted by William Harvey 1 on 25/02/2022 11:12:30:

…get a speed 66110 min-1 (whatever that means)…

Same as 66110rpm.

Andrew

Thanks Andrew – using Les's formula I get 66176 RPM so looks to be about the same.

So the maximum safe speed for the Corundum Vitrified Mount Points is 66110 RPM, I wonder what the minimum effective speed is? My Die Grinder will only go up to 25000.

"4 speed setting air regulator 8300-25000 RPM, Supplied with 1/8", 1/4" and 6mm collets"

So maybe I can't use them in my grinder?
25 February 2022 at 12:19 #587187
John P
Participant
@johnp77052
Google grinding pin speed there are plenty of examples out there
giving wheel diameter to rpm and metres /sec

like this one below

http://www.denchong.com/E/body.php?web=14&PNo=2007110150

John
25 February 2022 at 13:13 #587195
Anonymous
Posted by William Harvey 1 on 25/02/2022 12:17:59:

…will only go up to 25000…

Running at slower speeds makes the wheel appear softer, and therefore it will wear quicker. Practically I expect that running at 25000rpm will be fine.

Andrew
25 February 2022 at 13:29 #587200
Mike Poole
Participant
@mikepoole82104
An air powered pencil grinder can run at 60,000 rpm and is a useful tool for small mounted points, buying one specially to run some free points rather negates getting a nice freebie. I would use what you have to run them until you have used them up.

Mike
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