Thread: Changing the top quill bearing to a taper one on a HM52

No problem Ray, thanks.
Good to hear it all worked out and your happy with it.

Dave

Dave,
any reason why you didnt (or couldnt) use a 75 x 45 x 16 angular contact bearing in lieu of the taper roller?


pst...that way I wouldnt have to make a nut...hahaha

Hi Eskimo,
If I used a angular contact bearing, I would want a pair and a spacer on both inside and outside to keep preload on them set, way to much trouble for minimal gain.
Guys with Industrial hobbies mills have tried angular contact bearings in their mills (which are set up like these mills) and found they didn't work well, so they went back to taper bearings.
I think if you contact Ray he might be able to help you out, if not give me a yell and I will make you one.

Dave

Hi Eskimo (aka the ice man)

I have made a couple, one has you name on it! I haven't machined the tabs or tapped the 4mm locking grub screws...

I made a threaded arbor from some al, and used that to mount the 15mm plate. I got a bit impulsive and ordered an M40x1.5 tap... then thought I really should sort out better internal threading tooling... and bought the mesa insert threading and grooving tooling (which looks pretty useful) so immediately regretted buying the tap (don't ask what it cost!) You do stupid things sometimes...

For a one off, I would have done what Dave did and just weld a temporary shaft.





Just for interests sake... the thread on the NT30 ER32 collet chuck is M40x1.5

Now I have to think of other jobs that require an M40x1.5 thread to justify the cost...

Maybe I can charge Eskimo.... (just kidding)

Regards
Ray

Originally Posted by RayG

Hi Eskimo (aka the ice man)
Maybe I can charge Eskimo.... (just kidding)
Regards
Ray

They have come up nice
I think your time and work is worth something Ray.
I am yet to send him the bill for the design,lol

I did think of making some to sell for around $30-$40 each, but after I worked it out with the material, time, etc it wouldn't be worth it.
A one off for a mate like Eskimo I don't mind doing cheap, but not for someone I don't know at all.

I am glad you guys are finding the mods helpful, it may take me hours and sometimes months on and off to work out designs like the head riser, but when I put up the drawings and plans I gives me pleasure seeing somebody else getting use out of them and makes it worth going to the trouble to post them.

My Grandfather always told me when growing up, that if someone copied my idea I should take it as a complement because they thought it was a good idea as well.

Dave

Originally Posted by RayG

I have made a couple, one has you name on it!

Thank You Very Much Ray

Dave...your Grand Dad was spot on

I note that the chinese are not the only ones who use a deep groove ball bearing at the top of their spindle...even the the Arboga has them.........I refer to the spare parts list that gregoryq posted in neksmerj thread "Arboga EM825 Xmas Present"

https://www.woodworkforums.com/f65/ar...resent-128204/

In the Chinese defense, they probably don't know either and are putting their copy together mumbling "mad bloody Englishmen"

If it was a grinding spindle I could understand the deep groove as the only axial load would be the preload on the taper bearing. But with a mill there is the axial load from the helix on the cutter.

Maybe they know the deep groove on top will outlast the taper roller on the bottom.

I expect a report once you have worn the bearings out Dave.

Stuart

Originally Posted by Stustoys

I expect a report once you have worn the bearings out Dave.

am I going to be alive to be to read it

I am not sure if having the deep groove top bearing is wrong, it just seemed strange to me to have side loading on it when tapers are designed for that situation and other mills had 2 taper bearings standard on their quills. I feel these mills got lost in between the big bench top mills and the full size knee mills and corners where cut to save costs.
I think it runs better with the taper top one, but I did fix a few things at the same time so it's hard to say what is dong what.
As for wearing the new SKF bearings out, being only a home shop I don't think I will be wearing them out, but then you never know.lol
Some trailers are still going on their original taper bearings after 30-40 years.

Dave

Eskimo,
Did you end up fitting the tapered top bearing with the nut from Ray?

Dave

Hi Dave,

I suspect not, seeing as it's still on my bench...

Eskimo, PM me your address, and I'll send it.


Regards
Ray

LOL
So that's why he never posted up about how it went.

Dave

hahahaha

I was going to say when the email came in "I will let Ray tell you Dave"

and thanks Ray I always wondered if you ever finished it

PM sent

and thanks a million.....another one I owe..i'm never gunna get out of debt