Discussion:
large washers
(too old to reply)
Peter Fairbrother
2016-12-02 11:12:01 UTC
Permalink
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.

Any suggestions as to how to go about it? I was thinking boring head in
a mill, but that would be a right pain. Do they make end-on cutters for
boring heads?

Can't think of a lathe method.

Help?


Peter Fairbrother
David Billington
2016-12-02 11:27:53 UTC
Permalink
Post by Peter Fairbrother
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.
Any suggestions as to how to go about it? I was thinking boring head
in a mill, but that would be a right pain. Do they make end-on cutters
for boring heads?
Can't think of a lathe method.
Help?
Peter Fairbrother
Peter,

Depending on the quantity you require I would say consider getting
them laser cut. I use Freshlook out at Radstock and they have a £50
minimum order so £60 with the VAT but that'll include the material also.
If you want to stay local the I understand CAM Engineering in Trowbridge
do water jet cutting but no idea of their prices. I have heard of some
cheaper places for laser cutting in Bristol but don't have any names at
the moment.
Mark Rand
2016-12-03 22:57:55 UTC
Permalink
Post by Peter Fairbrother
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.
Any suggestions as to how to go about it? I was thinking boring head in
a mill, but that would be a right pain. Do they make end-on cutters for
boring heads?
Can't think of a lathe method.
Help?
Peter Fairbrother
If you need enough to use 500mm of stock, item 252633149437 on ebay.co.uk is
316 stainless round bar with a suitable diameter.


you'd want to turn the OD down, bore the ID, then part off the washers as you
went.

If cutting from plate on the mill, you could do worse than getting a couple of
hole saws of appropriate diameters and cutting the ID, followed by boring to
size, then cutting the OD and turning that to size after mounting the washer
on the outside of a 3-jaw chuck on the lathe.

If going down that route, drill a couple of holes hanging out to the scrap
side of each hole saw's path. That gives the chips a chance to clear
themselves from the saw and makes it cut properly.


You can grind a trepanning tool for a boring head. Start with a round blank,
remove half the diameter so the cutting width is on the diameter. Grind a bit
of relief on the bottom and off you go. Mounting a bit of 1/8" round HSS in a
1/2" round carrier can be better than doing it all with a 1/2" round HSS
blank!

Have fun.

Mark Rand
--
RTFM
Peter Fairbrother
2016-12-19 10:39:18 UTC
Permalink
Post by Mark Rand
Post by Peter Fairbrother
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.
Any suggestions as to how to go about it? I was thinking boring head in
a mill, but that would be a right pain. Do they make end-on cutters for
boring heads?
Can't think of a lathe method.
Help?
Peter Fairbrother
If you need enough to use 500mm of stock, item 252633149437 on ebay.co.uk is
316 stainless round bar with a suitable diameter.
you'd want to turn the OD down, bore the ID, then part off the washers as you
went.
If cutting from plate on the mill, you could do worse than getting a couple of
hole saws of appropriate diameters and cutting the ID, followed by boring to
size, then cutting the OD and turning that to size after mounting the washer
on the outside of a 3-jaw chuck on the lathe.
Tried that, with medium-grade holesaws, bimetalHSS. No go, they got blunt.

Expensive bimetals, very noisy, need hearing protection. Maybe I'm doing
something wrong ...


Any recommendations for holesaws for stainless?
Post by Mark Rand
If going down that route, drill a couple of holes hanging out to the scrap
side of each hole saw's path. That gives the chips a chance to clear
themselves from the saw and makes it cut properly.
You can grind a trepanning tool for a boring head. Start with a round blank,
remove half the diameter so the cutting width is on the diameter. Grind a bit
of relief on the bottom and off you go. Mounting a bit of 1/8" round HSS in a
1/2" round carrier can be better than doing it all with a 1/2" round HSS
blank!
Trying that now, using the 1/8 shank of a broken carbide drill in a
purpose-made holder. It makes a round groove, of sorts ..


-- Peter F
Post by Mark Rand
Have fun.
Mark Rand
Mark Rand
2016-12-19 14:46:28 UTC
Permalink
Post by Peter Fairbrother
Post by Mark Rand
Post by Peter Fairbrother
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.
Any suggestions as to how to go about it? I was thinking boring head in
a mill, but that would be a right pain. Do they make end-on cutters for
boring heads?
Can't think of a lathe method.
Help?
Peter Fairbrother
If you need enough to use 500mm of stock, item 252633149437 on ebay.co.uk is
316 stainless round bar with a suitable diameter.
you'd want to turn the OD down, bore the ID, then part off the washers as you
went.
If cutting from plate on the mill, you could do worse than getting a couple of
hole saws of appropriate diameters and cutting the ID, followed by boring to
size, then cutting the OD and turning that to size after mounting the washer
on the outside of a 3-jaw chuck on the lathe.
Tried that, with medium-grade holesaws, bimetalHSS. No go, they got blunt.
Expensive bimetals, very noisy, need hearing protection. Maybe I'm doing
something wrong ...
Any recommendations for holesaws for stainless?
What speed were you running at. you need a lot of pressure and no more than
60rpm for 85mm in stainless. Clearance holes for the chip also a very good
idea.


regards
Mark
RustyHinge
2016-12-24 10:41:24 UTC
Permalink
Post by Mark Rand
Post by Peter Fairbrother
Post by Mark Rand
Post by Peter Fairbrother
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.
Any suggestions as to how to go about it? I was thinking boring head in
a mill, but that would be a right pain. Do they make end-on cutters for
boring heads?
Can't think of a lathe method.
Help?
Peter Fairbrother
If you need enough to use 500mm of stock, item 252633149437 on ebay.co.uk is
316 stainless round bar with a suitable diameter.
you'd want to turn the OD down, bore the ID, then part off the washers as you
went.
If cutting from plate on the mill, you could do worse than getting a couple of
hole saws of appropriate diameters and cutting the ID, followed by boring to
size, then cutting the OD and turning that to size after mounting the washer
on the outside of a 3-jaw chuck on the lathe.
Tried that, with medium-grade holesaws, bimetalHSS. No go, they got blunt.
Expensive bimetals, very noisy, need hearing protection. Maybe I'm doing
something wrong ...
Any recommendations for holesaws for stainless?
What speed were you running at. you need a lot of pressure and no more than
60rpm for 85mm in stainless. Clearance holes for the chip also a very good
idea.
You can get diamond-encrusted holesaws now - they're not enormously
expensive and they tend not to wear out...
--
Rusty Hinge
To err is human. To really foul things up requires a computer and the BOFH.
RustyHinge
2016-12-06 15:52:50 UTC
Permalink
Post by Peter Fairbrother
I want to buy/make some large washers in 3mm stainless, about 85mm OD
and 30-75 mm ID.
Any suggestions as to how to go about it? I was thinking boring head in
a mill, but that would be a right pain. Do they make end-on cutters for
boring heads?
Can't think of a lathe method.
Help?
Search on 'mudguard washers'?
--
Rusty Hinge
To err is human. To really foul things up requires a computer and the BOFH.
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