Bosch Colt started squeaking, so I replaced the bearings.

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will1384
Posts: 80
Joined: Sat Nov 23, 2013 5:48 am

Bosch Colt started squeaking, so I replaced the bearings.

Post by will1384 » Tue Mar 18, 2014 9:21 pm

I recently pushed my Bosch Colt router a little to hard, when testing out my Mach3 configuration, and the bearings started squeaking, so I stared looking on the Internet for a fix.

I found a few web pages:

Bosch Colt Overheating
http://www.microcarve.com/forum/showthread.php?tid=71

Bosch PR20EVSK Colt Router Bearings
http://www.contractortalk.com/f40/bosch ... ngs-91669/

BOSCH Colt Trim Router Maintenance
http://www.cncsharktalk.com/viewtopic.php?f=2&t=1007

Bosch PR20EVS (3601F0A710) Router Parts sells parts, but also shows a parts diagram
http://www.ereplacementparts.com/bosch- ... _9840.html

I ordered 627-2Z Bearing and 6002-2Z Bearing from ebay, and replaced the bad bearings, I decided to take a few images.

Here is the Bosch Colt without the case.

Image

I had trouble finding a proper bearing puller for the smaller bearing, so I used an automotive puller with a metal PCB board standoff stuck in the end of the automotive puller, the big bearing just comes off after you take a round nut off, I forgot to include the round nut in the image.

Image

I have an arbor press but the Bosch Colt was to big for it, so I wrapped the Bosch Colt in a leather glove, placed it in a vice, and used a dead blow hammer and a 9mm socket to replace the smaller bearing.

Image

There is a grove cut into both sides of the shaft that helps lock the shaft so you can replace the bit, it can also be used to help put the Bosch Colt back together.

Image

Image

Image

RobCee
Posts: 587
Joined: Wed Jan 08, 2014 11:33 am
Location: Birmingham, UK

Re: Bosch Colt started squeaking, so I replaced the bearings

Post by RobCee » Tue Mar 18, 2014 9:23 pm

Does it still work Will? :lol:
ShapeOko2 #3400 - Chinese 800W AC Spindle - Stiffened X-Axis - TR10 Z-Axis - Inverted Z Motor - Hall Effect Limits - Drag Chains & Custom Brackets

will1384
Posts: 80
Joined: Sat Nov 23, 2013 5:48 am

Re: Bosch Colt started squeaking, so I replaced the bearings

Post by will1384 » Tue Mar 18, 2014 11:53 pm

RobCee wrote:Does it still work Will? :lol:
Yep it seems be functional, I remember reading something about letting the new bearings run with out using the Bosch Colt, so the bearings can adjust or burn-in, but I don't know how true that is, I did let it run for about 5 minutes and the squeaking was gone, I removed the covers from the larger bottom bearing that I replaced, because the plastic covers looked a little melted, but the bearing looked fine and moved freely, :?: I am just glad my router is working again.

danimal
Posts: 332
Joined: Wed Mar 13, 2013 5:53 pm
Location: Colorado

Re: Bosch Colt started squeaking, so I replaced the bearings

Post by danimal » Wed Mar 26, 2014 6:37 pm

will1384 wrote:
RobCee wrote:Does it still work Will? :lol:
Yep it seems be functional, I remember reading something about letting the new bearings run with out using the Bosch Colt, so the bearings can adjust or burn-in, but I don't know how true that is, I did let it run for about 5 minutes and the squeaking was gone, I removed the covers from the larger bottom bearing that I replaced, because the plastic covers looked a little melted, but the bearing looked fine and moved freely, :?: I am just glad my router is working again.
I have done this on a couple different small motors now for various projects, and it is a really good idea to balance the shaft prior to installing the new bearing. On tools like these that are subjected to a lot of perpendicular force the balance can be thrown off and that too causes accelerated bearing wear. I just use the dual razor blade method and a dremel tool. My DW660 was so off balance that I could not believe it didn't shake itself apart. Also I was getting a bunch of heating problems with the dewalt early on and I am pretty sure that my 660 was out of balance from the factory.
Shapeoko # 1458

RT0701C Spindle || dual y motor || x axis nema23 with custom carriage 1000mm length || z axis nema23 linear rail upgrade with 1/2-10 ACME

will1384
Posts: 80
Joined: Sat Nov 23, 2013 5:48 am

Re: Bosch Colt started squeaking, so I replaced the bearings

Post by will1384 » Thu Mar 27, 2014 3:38 am

danimal wrote:
will1384 wrote:
RobCee wrote:Does it still work Will? :lol:
Yep it seems be functional, I remember reading something about letting the new bearings run with out using the Bosch Colt, so the bearings can adjust or burn-in, but I don't know how true that is, I did let it run for about 5 minutes and the squeaking was gone, I removed the covers from the larger bottom bearing that I replaced, because the plastic covers looked a little melted, but the bearing looked fine and moved freely, :?: I am just glad my router is working again.
I have done this on a couple different small motors now for various projects, and it is a really good idea to balance the shaft prior to installing the new bearing. On tools like these that are subjected to a lot of perpendicular force the balance can be thrown off and that too causes accelerated bearing wear. I just use the dual razor blade method and a dremel tool. My DW660 was so off balance that I could not believe it didn't shake itself apart. Also I was getting a bunch of heating problems with the dewalt early on and I am pretty sure that my 660 was out of balance from the factory.
I had to read up on using the "dual razor blade method" found a little about it here

http://towboatjoe.tripod.com/shafts.htm

and

http://www.aquacraftmodels.com/accessor ... uning.html

and

http://www.featherlightppg.com/2012/04/ ... -balancer/

I would have never thought about something like that, thanks for the idea.

danimal
Posts: 332
Joined: Wed Mar 13, 2013 5:53 pm
Location: Colorado

Re: Bosch Colt started squeaking, so I replaced the bearings

Post by danimal » Fri Mar 28, 2014 1:57 pm

I went ahead and bought an engineering level for my setup and a couple of the long razor blades for the extended razor knives at home depot and it was pretty easy to set up. The level was a little pricey, but I figured that I could use it for a number of other projects and I suspect a quality pocket level would have done fine.
Shapeoko # 1458

RT0701C Spindle || dual y motor || x axis nema23 with custom carriage 1000mm length || z axis nema23 linear rail upgrade with 1/2-10 ACME

danimal
Posts: 332
Joined: Wed Mar 13, 2013 5:53 pm
Location: Colorado

Re: Bosch Colt started squeaking, so I replaced the bearings

Post by danimal » Fri Mar 28, 2014 3:33 pm

Here is a good source for static and dynamic balancing. I don't have the setup for dynamic balancing, but a rigid rotor that is not statically balanced can not be in dynamic balance either. I just look for where material was removed on the rotor from the factory and use that as a rough guide to make some small adjustments if necessary.

http://www.bksv.com/doc/bo0276.pdf
Shapeoko # 1458

RT0701C Spindle || dual y motor || x axis nema23 with custom carriage 1000mm length || z axis nema23 linear rail upgrade with 1/2-10 ACME

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