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securing a facing cutter on an arbour

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Ian Welford17/05/2010 22:14:37
300 forum posts
Guys
 
Bought a 5 tipped facing cutter ( Maydown 80mm ) and made a 27mm arbour to fit the same. Arbor ahs a securing bolt to keeop attached to cutter BUT  There is enough movement radially to cause chatter.
 
I don't want to make another arbour , so I'm thinking about stopping rotation of the cutter body around the arbour by adding 1 or 2 either securing pins or cap headed bolts to stop it.
 
Questions are-
1 should the cap head or pins go into the facing flange aginst which the sutter sits?
2 Alternatively they could go into the 27mm central boss of the arbour.
 
I am favouring 1 as then if they shear at any time I can easily redrill but anyone tried it?
 
Arbour is nive free machining steel. I know I shoudl have made an arbour with 2 flanges to fit in the drive gaps on the cutter but didn't see how I could do it at the time without dismounting then remounting the arbour on the 3MT tape which it's attached to.
 
Don't think loctite will stand the temperatures generated whilst cutting.
 
Thanks
 Ian
#
 
macmarch18/05/2010 10:16:35
147 forum posts
1 photos
I presume that your cutter is of the shelllmill type. Does it not have a keyway in the bore? For this size of cutter with the ability to remove large amounts of material at one pass it needs one. I would suggest that you fit a cap head onto the stub mandrel and cut a recess in the bore of the cutter to locate on the head. hth
 
ray
 
JasonB18/05/2010 11:20:22
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25215 forum posts
3105 photos
1 articles
Does it not have a keyway along the top face, this can engage on the drive tabs on the end of your spindle nose, looks like most of their cutters have this keyway. Or the flange on the arbour should have some form of drive pins likethese or if its MT 3 then the pins need to extend to engage on the spindle like these
 
Edit , reading it again you do have the large top keyway and an MT taper. I would drill & ream the arbour flange for a couple of dowel pins, these can be retained with grub screws from the side of the flange bearing onto flats on the pins. This can be done with the arbour assembled and will transfer the rotational forces from the cutter to the spindle with no risk or turning the MT Taper under load
 
Jason

Edited By JasonB on 18/05/2010 11:24:54

Edited By JasonB on 18/05/2010 11:26:42

Edited By JasonB on 18/05/2010 11:32:19

Circlip18/05/2010 11:50:30
1723 forum posts
Mill a couple of round ended pockets into the sides of the larger diameter of the arbour and let in a couple of pegs retained with C/S allen screws. Similar effect to JasonBs post but the drive is on a flat surface.
 
  Send yer E-mail via P/M
 
  Regards  Ian.
Ian Welford18/05/2010 21:27:35
300 forum posts
Thanks for the ideas. I like the idea of milling a couple of pins in then securing with grub screws. My idea of cap heads doesn't give as much contact area but is faster!
 
Didn't know about arbours with transmission pins Jason- thanks for that .
 
 
I think I'll sleep on it then try the inset pins. If that fails I can always mill the pockets as you say Circlip.
 
Should I use silver steel and harden the pins or just use EN1A as is ?
 
Despite the chatter I found it works really well at about 800rpn and 25thou cuts! Mind you the steel chips come off blue, as did my language when one found it's way into my glove!
 
Thanks again guys.
 
Ian
Terryd19/05/2010 10:38:37
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1946 forum posts
179 photos
Hi Guys,
 
Just a light hearted two 'pennorth but why are you discussing 'bowers', 'pergolas' and 'restful flower covered lattices or trelliswork' in an engineering publication, surely it should be in a gardening one.  That is an arbour!
 
Or do you mean 'arbor' i.e. 'a machine spindle to support a cutting device' ?
 
Regards with respect,
 
Terry
Ian Welford20/05/2010 22:12:02
300 forum posts
OOps
 
Isn't an 'Arbour somewhere to keep boats as well ?
 
Circlip- did you get e mail?
 
Ian
Circlip21/05/2010 09:37:50
1723 forum posts
Sent a reply yesterday at 10.59.17am to the Yahoo address you gave me, re-forwarded today (Friday) at 08.33.18 to same address, perhaps you got the M/E server disease??
 
   Regards  antother Ian.

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