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martin54
31-12-2012, 01:39 AM
Not sure if this is in the right place but couldn't see where else it should go.

Couldn't see any uk sellers for the mount for chinese 2.2kw water cooled spindles, so was just wondering if anyone knew of a supplier or if not where abroad was best to get them, I am guessing that they don't come with the spindle.
Would I be right in thinking that these spindles are pretty much all 80mm diameter?
The existing mount on the gerber is about 115mm so probably easiest to just purchase a new mount when I change the spindle.

wilfy
31-12-2012, 02:18 AM
i think most people have them custom made to fit their machine... thats certainly what i intend to do

Shinobiwan
31-12-2012, 04:29 AM
The 2.2Kw model is 80mm dia. It varies for the others.

As for Spindle mount options your looking at making your own really. You can get them from places like ebay US and various CNC retailers over there but shipping makes it expensive.

If your feeling adventurous then using an SMA50 linear bearing housing with the bearing case removed provides exactly an 80mm dia bore. This is a very sturdy mount for the spindle since you've got over half of it clamped. You do have modify it a little though by cutting a channel in the side for the clamping action. Pretty simple really if you've got the right tool for the job(band saw, radial arm saw, a jigsaw with a good metal blade or if you clamped and set up a jig then a regular hand router with 3mm dia straight bit would do a great job). I'm surprised some enterprising sort isn't knocking these out to be honest. There's certainly a gap in the UK for it.

The housing is 21+vat from Gary at Zapp.

SMA50UU Linear Bearing with housing (http://www.zappautomation.co.uk/en/sma-linear-bearing/557-sma50uu-linear-bearing-with-housing.html)

7797 7799

Washout
31-12-2012, 12:42 PM
Wow - I had no idea that was a bearing block - thought it was a dedicated motor mount.

Most definately going on my shopping list.

Thanks


Chris

martin54
31-12-2012, 01:50 PM
Thanks for the replies people, will have another look round ebay & also have a think about Ant's way round it. Surprised that most of the people who sell the spindles don't also sell the mounts as well.

WandrinAndy
31-12-2012, 04:02 PM
....Surprised that most of the people who sell the spindles don't also sell the mounts as well.

Agree... also surprised that they don't offer more variety of ballnut mounts!

A little while ago Jonathan was making 80mm spindle mounts, so I bought a pair... they look the business... I would give him a shout.....

HankMcSpank
31-12-2012, 06:03 PM
I reckon there's a good little sideline for someone with enough nous to start a website specialising in custom spindle mounts...because everyone hits the same issue "where the hell do I buy a mount"....and it's catch 22 - i.e. your machine isn't built yet, so you can't make your own blah blah. (and my machine wouldn't be able to cut ali anyway once built!)

drumsticksplinter
15-03-2013, 03:41 PM
Hi,

I just stumbled across this post and have a different idea for the sma50uu housing... does this housing have circlips front and back to retain the bearing bushing?

Thanks.

martin54
15-03-2013, 04:00 PM
Hi,

I just stumbled across this post and have a different idea for the sma50uu housing... does this housing have circlips front and back to retain the bearing bushing?

Thanks.

Yes it does, worked a treat for the spindle.

drumsticksplinter
15-03-2013, 04:33 PM
Great, I'm wondering if the 80mm bore is a bearing fit / interference fit??

Jonathan
15-03-2013, 05:51 PM
Great, I'm wondering if the 80mm bore is a bearing fit / interference fit??

Once you remove the cir-clips the bearing pushes out with a light tap.

zephy1
18-01-2016, 07:04 PM
The 2.2Kw model is 80mm dia. It varies for the others.

As for Spindle mount options your looking at making your own really. You can get them from places like ebay US and various CNC retailers over there but shipping makes it expensive.

If your feeling adventurous then using an SMA50 linear bearing housing with the bearing case removed provides exactly an 80mm dia bore. This is a very sturdy mount for the spindle since you've got over half of it clamped. You do have modify it a little though by cutting a channel in the side for the clamping action. Pretty simple really if you've got the right tool for the job(band saw, radial arm saw, a jigsaw with a good metal blade or if you clamped and set up a jig then a regular hand router with 3mm dia straight bit would do a great job). I'm surprised some enterprising sort isn't knocking these out to be honest. There's certainly a gap in the UK for it.

The housing is 21+vat from Gary at Zapp.

SMA50UU Linear Bearing with housing (http://www.zappautomation.co.uk/en/sma-linear-bearing/557-sma50uu-linear-bearing-with-housing.html)

7797 7799

I'm attempting to do this setup with an SMA50 block, however, the block hole is 75mm not 80mm. The LM50 bearing case is also 75mm, while all adverts for this case give 80mm as the dimension. Any ideas on how to get the spindle in?

routercnc
18-01-2016, 11:20 PM
If you have access to a lathe then a 4-jaw chuck, centralised using a DTI on the existing bore, then bored out to 80mm. Creep up on the final cut as it's quite a deep part.

If you have access to a milling machine then a flycutter, or a proper boring head if it will cut a part that deep. I don't have one myself but imagine they are expensive.

Do all this before you make the slit etc.

If you have neither, then do you have the receipt! Would the supplier swap it for an 80mm version?

JAZZCNC
18-01-2016, 11:33 PM
I'm attempting to do this setup with an SMA50 block, however, the block hole is 75mm not 80mm.

Then it's not SMA50 because the bearings are 80mm. I use them all the time and never had one 75mm.

Neale
19-01-2016, 09:09 AM
I have one of these 75mm mounts sitting in the workshop at the moment which was given to me. When I measured it, I realised why it was being thrown out... When I get round to it, I'll stick it on the milling machine and run the boring head through it. There seems to be plenty of meat in the casting to do this. Only minor difficulty is that someone has already cut the slot down one side so I'll have to shim that and clamp up before boring.