Cylindrical Grinding Attachment

[Shaun ChurchillParticipant @shaunchurchill54517]

I am in the process of making a couple of attachments for my surface grinders to be able to grind diameters either between centres or in a a v-block holding device which allows diameters to be clocked in or ground eccentrically. My question is I wish to motorise these attachments so there is no need to rotate the workpieces manually, but I have no idea as to what kind of rpm range I should be looking at. I do not forsee that I shall be grinding diameters in excess of 30mm and whatever motor I use it will have a VFD or variable speed control. Any suggestions would be welcome.

Thanks in anticipation.

Shaun

[Dave SParticipant @daves59043]

I would go fairly slow, maybe 50 – 100 rpm

The cutting sfm speed comes mostly from the wheel rpm, in effect the rotation is just like the feed.

You can probably do the maths based on the normal feed rate of the table and combine with pi and diameter to give equivalent feed rate at a few different diameters to get an idea of the range

 

Dave

[Wade BeattyParticipant @wadebeatty78296]

A cylindrical grinding attachment for my surface grinder is on my list of tools to make, keep us updated on your progress please.

Stefan Goteswinter has a couple of videos at

There is a link in the text below the video to another site with more about an attachment.

One of the videos mentions a German manufacturer of an attachment and it looks very nice but is priced in cubic dollars. But good inspiration and ideas. It used a dog system to drive the piece being ground.

 

Wade

[Shaun ChurchillParticipant @shaunchurchill54517]

Cheers Dave S,

I didnt think the RPM would be high and  initially looking at using a former cordless drill motor hooked up to a home made PWM speed controller to see how it goes and then perhaps get something a tad less heath robinson. I managed to pick up an unused Harig Grind-All spin indexer which is OK for OD grinding over short dimensions but needed something that would allow me to grinder over longer dimensions between centres.

I had seen the Stefan Gotteswinter YT video and am aware of the likes of Mayform grinding attachments but these are rare and always command a premium price.

[Shaun ChurchillParticipant @shaunchurchill54517]

[Shaun ChurchillParticipant @shaunchurchill54517]

[bernard towersParticipant @bernardtowers37738]

I have to admit to going the cheapand cheerful route as I use a spare Taig headstock which can be fitted to my Stent and also my LIP 55 (the same as Stefans). It can be hand rotated or motorised.

[Wade BeattyParticipant @wadebeatty78296]

thanks for the photos Shaun

[John PParticipant @johnp77052]

Hi

I found this  sheet in my Hasler speed indicator   ,i may be of some  use   for setting   work speed

for grinding  .I don’t usually bother   too  much ,  just use   what  looks about right.

My own machine   has a work speed range   from about 20 rpm   up to about 700 rpm.

 

[Shaun ChurchillParticipant @shaunchurchill54517]

Many thanks John P👍👍

[Wade BeattyParticipant @wadebeatty78296]

Shaun, is the base  of the cylindrical grinder in your photos cast iron?

[Shaun ChurchillParticipant @shaunchurchill54517]

No Wade, its made from tool steel thats been hardened and ground.

[Wade BeattyParticipant @wadebeatty78296]

<p style=”text-align: left;”>Very nice</p>

[Wade BeattyParticipant @wadebeatty78296]

Sorry for the endless questions Shaun

Is there a way to lock the left-right (without getting into what letter that is) feed on your surface grinder? I see videos of people with all sorts of jigs on their surface grinders that seemingly would require a lock on the long table. My surface grinder has a lock switch for the in-out feed but nothing on the left-right.

Thanks,

 

Wade

[Shaun ChurchillParticipant @shaunchurchill54517]

Hi Wade,

I have two surface grinders – one being an improved chinesium Warco and the other a British made Eagle. Neither of them have a lock on the reciprocating axis and like you have often concerned myself about this when working on jobs where it would be safer to lock the table. Having said that the effort required for the wheel rotation to “kick” the table on the Eagle is considerable and of course I always maintain the wheel so it is off centre and doesn’t dig in. What I do always have to remember though is the wheel rotation on my two surface grinders is totally different! Yes, it would be nice to lock the table movement but so far in practice with a bit of care it hasnt been necessary to do so. I tend to only use the cylindrical grinding fixtures on the Eagle surface grinder as it has a much slower rotational speed. Hope this answers your question. I do agree with you the axis designation for surface grinders never makes sense to me either😂

Shaun

[Shaun ChurchillParticipant @shaunchurchill54517]

[Wade BeattyParticipant @wadebeatty78296]

Nice machines Shaun

 

My Degen FSHQ 300-V

[Shaun ChurchillParticipant @shaunchurchill54517]

Not familiar with that make Wade but looks superb. My experience with surface grinders is limited to mainly J & S 540’s, Exe and a really unpleasant Russian made Stankimport machine – a machine so bad I would rather forget it!

[not done it yetParticipant @notdoneityet]

It may be of interest to look up vids by “the shed dweller” on youtube.  I didn’t follow all his progress, but there may be some ideas to take on board.

[Wade BeattyParticipant @wadebeatty78296]

I came upon this page today. If you scroll down to the Haas universal grinder brochure there are many rinding attachment ideas. The auxiliary table was a good idea.

https://forum.zerspanungsbude.net/viewtopic.php?f=74&t=86596&start=240

[Peter Neill 1Participant @peterneill1]

I stumbled across this topic whilst having one of my rare browses on this forum, and though somewhat late to the subject, thought I could possibly add a little to it.
I made a cylindrical grinding attachment for my J&S 540 a couple of years ago, and for driving the spindle I used a small 15W 12vDC gear motor rated at 500rpm, and which is powered by a ubiquitous wall-wart. I know this may sound like it’s underpowered, but believe me it is not.

Depending on which size drive pulley I use, I get speeds of either 240rpm or 180rpm, both of which are in the typical mid-range for work head speed on a cylindrical grinder.
It works very well and has driven a 2″ diameter x 6″ long shaft very easily, with only very minor speed reductions when engaging the grinding wheel, but with enough torque to continue driving consistently.

Then again we are only taking very small cut increments on these things, so not an awful lot of power is actually needed. Happy to provide further details if required.

[Wade BeattyParticipant @wadebeatty78296]

Thank you Peter, nice and simple design

[Wade Beatty]

On Wade Beatty Said:

Thank you Peter, nice and simple design

Took quite a lot of work to make it look that simple:)

[Wade BeattyParticipant @wadebeatty78296]

Of course! Thanks for the details

 

W

[Mark RandParticipant @markrand96270]

Like the tailstock height adjustment. I guess that it’s extremely precise/sensitive?

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