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Tool Needing a press

Tool
MashingMetal

MashingMetal

Super User
I’m at the point of replacing the spindle bearings for the mill/drill in the rebuild process. I have always got by with medium sized arbor press but I need something larger. How big do I need 20t? I don’t need anything huge but I don’t want anything undersized either.
Thanks!
 

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I don’t think you will need a 20 ton. You should be able to get the bearing races out fairly easy. With a block of dowel and a hammer. I guess you could press them out others have. I followed these directions when I did mine.
Post using a press.

Spindle Bearing Replacement For The Rf-31 Mill/drill

During my quest to eliminate the excessive runout on my RF-31 Mill/Drill I determined that the spindle bearings were a major contributor. As you can see, these bearings have seen better days. In addition to being filthy, they have not been maintained and have worn much earlier than they should...
www.hobby-machinist.com
 
My experience with bearings or any size is that none of them require a great deal of pressure to either press in or to remove. If you are talking about "how much physical space do I need to position the thing in the press" that may be another story. Have you tried with the arbor press and it didn't have the oomph?
 
i also dont think you will need much tonnage to actually press the bearings, but you might need a 20t or more to have a large enough frame to fit that whole shebang in
 
Here an excellent write-up on replacing bearings on an RF30/clone

Spindle Bearing Replacement For The Rf-31 Mill/drill

During my quest to eliminate the excessive runout on my RF-31 Mill/Drill I determined that the spindle bearings were a major contributor. As you can see, these bearings have seen better days. In addition to being filthy, they have not been maintained and have worn much earlier than they should...
www.hobby-machinist.com
 
mickeyf said:
My experience with bearings or any size is that none of them require a great deal of pressure to either press in or to remove. If you are talking about "how much physical space do I need to position the thing in the press" that may be another story. Have you tried with the arbor press and it didn't have the oomph?
Click to expand...
My arbor press does have the hight unfortunately, it’s good for about 10”
 
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I have a limited number of sizes of bushings (to push on the bearing). I do have a set of 3/4” sockets and they work well to act as a bushing. Don’t forget- heat is your friend. You may have to make a custom bushing.
You have my contact info/address (from meetup carpool) so let me know if you want to give it a try.

CW
 
Q1) Dumb question but what is the driving parameter that defines the rated capacity of these rack & pinion style presses? Example a 1-ton is 2000 pounds. Is that the maximum shear force of the engaged pinion teeth? I cant imagine the say 1"x1" solid steel arbor is anywhere close to failing or distorting in compression. The C-frame is probably deflecting a bit but they don't exactly look like precision instruments for how the arbor is set perpendicular to plate (or maybe that's the just the ones I'm looking at haha).

Q2) I haven't seen many pics where people attach an accessory on the end of the arbor to suite an application. Lets say you need a smaller circular press profile. Do you just rest that under the square arbor face or is there a hole in the end to capture various shop made profiles?

Q3) I got looking at the size of even small presses compared to the length of broaches. Even a 2-3mm wide broach is 5-6" long. Seems to me that requirement puts you into a larger press? Shallow bearings etc. can be handled OK but broaching seems to be a different animal?

1746986862771.png
 
David said:
Here an excellent write-up on replacing bearings on an RF30/clone

Spindle Bearing Replacement For The Rf-31 Mill/drill

During my quest to eliminate the excessive runout on my RF-31 Mill/Drill I determined that the spindle bearings were a major contributor. As you can see, these bearings have seen better days. In addition to being filthy, they have not been maintained and have worn much earlier than they should...
www.hobby-machinist.com
Click to expand...
Thanks for the link, something to consider. I am going to get apart and see what the spindle is doing for run out mounted in the lathe. It may end up being more of a drill than a mill. I have the MT3 reamer ready, hopefully get somewhat decent results. Then work forward on bearings.
CWret said:
I have a limited number of sizes of bushings (to push on the bearing). I do have a set of 3/4” sockets and they work well to act as a bushing. Don’t forget- heat is your friend. You may have to make a custom bushing.
You have my contact info/address (from meetup carpool) so let me know if you want to give it a try.
Click to expand...

Thanks for the offer once again. Now we are on the outdoor season this project will be on the slow boat. Maybe a few months away.
 
Another vote for no press needed. Interference fits change the internal geometry, so precision installations have light interference fits. When I did my XLO, pullers and mallets got it apart and it went together with a hot plate (bearing warmed up) and the retaining nuts. Even if you get a hot bearing stuck half way on using heat, its legitimate to tap it home with a piece of pipe and mallet (face the pipe contact is only made with the inner race)

The cardinal rule with bearing assembly, is never ever apply a force through the rolling elements. e.g. if the inner race is interference to the shaft, don't drive the bearing on by force applied to the outer race. THAT is why with most assemblies, the bearings are scrap after taking them apart. Just never break that rule, and things should be ok
 
MashingMetal said:
@Susquatch Yes I do have a lathe or two. Definitely may require some bushings.
Click to expand...

My comment was actually aimed at @CWret. I just assumed you didn't have a lathe. My bad.

But all the better if it applies directly to you too!

Awesome how that worked out!

Since we now know you have a lathe and can make custom bushings, I guess it's not too early to suggest custom collets and pullers too!

The lathe has always been my favorite tool. They are sooooo empowering!
 
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