Bizarro Step pulley

M

Mattyboy

Plastic

Joined

Feb 1, 2018

• Feb 1, 2018

• #1

Adding to my queries from "head swapping" thread earlier today...

The newer J head (1.5hp motor) has a bizarro issue with the step pulleys. I ran the head to check it was ok before attempting to mount it on the older machine. Three of the four speed settings run fine but on the third pulley set down (speeds 420/3500 according to the speed info plate)the v belt is so loose its barely touching the pulleys.

I assumed the four steps are one unit machined from one lump of Aluminium, is this not the case?

Can I take the pulleys from the older head(1hp motor) and swap them or are they different sizes?

Thanks, Matt.

 

JRIowa

Diamond

Joined

May 27, 2003

Location

Marshalltown, Iowa, USA

• Feb 2, 2018

• #2

Something is strange here. AFAIK, the J head was never offered with a 1.5hp motor. The very early 2J heads came with that motor.

Just saying, you have a J head, why don't you rebuild that head and be done with it?
Bridgeport Rebuild Kits
Everything you need for a BP is here.

The other this is to get yourself a manual. KneeMills.com - Knee Mill Documentation
JR

 

M

Mattyboy

Plastic

Joined

Feb 1, 2018

• Feb 2, 2018

• #3

I'll grab pictures of the motor data plate from each motor and the speeds from the head. Maybe incorrect motor on the head? I have read that an overly powerful motor can put excess wear on bearings and such.

 

JRIowa

Diamond

Joined

May 27, 2003

Location

Marshalltown, Iowa, USA

• Feb 2, 2018

• #4

Not maybe, probably. Don't know where you read that, BS. BPs are not the most rigid machine out there. Most of the time, you have more HP than you need. If you try and push a BP too hard, it just might walk out the door.
JR

 

H

HWElecRepair

Hot Rolled

Joined

Dec 9, 2013

Location

Fort Wayne, IN

• Feb 2, 2018

• #5

If one of the speeds is funky like that, the head was most likely run far more in that speed than in the other speeds and it is just that wore out.

Just out of pure dumb curiosity, you did push the motor back and tighten it after moving the belts right? That isnt meant as anything offensive, sometimes its the super easy stuff that gets overlooked.

Jon
H&W Machine Repair

 

M

Mattyboy

Plastic

Joined

Feb 1, 2018

• Feb 2, 2018

• #6

No offence taken Jon. Yes I checked the motor was pushed back as that was my first thought too. Then checked it on the other three pulley sets again to make sure I hadn't stretched the belt somehow, all worked fine.

 

M

Mattyboy

Plastic

Joined

Feb 1, 2018

• Feb 2, 2018

• #7

Here's pictures of the motors.
Original "Pancake" 1hp and corralating speed sets
Newer head 1.5hp motor and speed chart
What do you think JR?

 

Attachments

• 
  newer motor 2.jpg

  92.4 KB · Views: 119
• 
  newer motor 1.jpg

  89.1 KB · Views: 113
• 
  pancake motor 2.jpg

  94.9 KB · Views: 89
• 
  pancake motor 1.jpg

  93.2 KB · Views: 187

M

Mattyboy

Plastic

Joined

Feb 1, 2018

• Feb 2, 2018

• #8

Checked out those manuals JR, thanks. Looks like I have a 'J-head Hi-speed'

 

JRIowa

Diamond

Joined

May 27, 2003

Location

Marshalltown, Iowa, USA

• Feb 2, 2018

• #9

Mattyboy said:

Looks like I have a 'J-head Hi-speed'

Click to expand...

Yup! And it was probably ran at high speed it's entire life. So, unless you're going to be running real big boring heads or cutters, I'd rebuild and keep it.
JR

 

M

Mattyboy

Plastic

Joined

Feb 1, 2018

• Feb 2, 2018

• #10

Unfortunately theres no budget for buying any replacement parts to rebuild. Thats why I was hoping to just swap heads as the other head was given to us by another department. May have to strip parts from both to build one goodun'.