O Mill vertical drive gear

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23rd April 2015, 01:38 AM
allterrain50

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O Mill vertical drive gear

I have been asked to do something about making new helical drive gears for the vertical head of the O mill. I am not sure if there have been any changes to the specs of this gear anytime during their manufacturing run. With this in mind, I would appreciate any owners who can give me good accurate dimension such as thickness, diameter, bore, toothcount and mounting hole dia and spacing, along with the machine number to identify in what order any changes may have taken place.
I have noticed changes in the size of the fibre gear and shaft gear on the motor drive unit and am reluctant to invest in the project of making the vertical head part in case there are similar variants.
regards Mal
24th April 2015, 07:25 AM
bwal74

Hi Mal,

I'll be back early June if that's not too late. Hopefully I'll have saved enough money to buy a 3 Jaw for my mill as well.

Cheers Ben.
25th April 2015, 10:21 AM
Anorak Bob

Hello Mal,

My mill is a early version with the serial number OL-8. I will remove the head and measure the gear for you in the next day or so.

Bob.
25th April 2015, 12:05 PM
allterrain50

Quote:

Originally Posted by Anorak Bob

Hello Mal,

My mill is a early version with the serial number OL-8. I will remove the head and measure the gear for you in the next day or so.

Bob.

Thanks Bob,
That would be great to have one that early as a starting point.
Mal
27th April 2015, 07:42 PM
SurfinNev

These are what I get.

Hercus OLM-288

Dia. 3.2370"
Width 0.7540"
Bore 0.7500"
Teeth 47
Mounting hole dia. 0.2625"
Spacing 1.6250"
C/bore dia. 0.4070"
C/bore depth 0.2700"

Hope that helps.
27th April 2015, 09:06 PM
allterrain50

Quote:

Originally Posted by SurfinNev

These are what I get.

Hercus OLM-288

Dia. 3.2370"
Width 0.7540"
Bore 0.7500"
Teeth 47
Mounting hole dia. 0.2625"
Spacing 1.6250"
C/bore dia. 0.4070"
C/bore depth 0.2700"

Hope that helps.

Thanks Nev,
I'll check it against Bob's when he sends it. Anyone got one with a higher number than Nev's.
Mal
3rd May 2015, 11:30 AM
SurfinNev

Bump. Anyone else with the gear dimensions? :D
3rd May 2015, 01:07 PM
Anorak Bob

8 Attachment(s)

OK Nev, you've made me feel sufficiently guilty that I've stopped painting a window frame to pull the gear off the mill for a few measurements.

Dia. 3.238"
Width 0.753"
Bore 0.750"
Teeth 47
Mounting hole dia. 0.270"
Spacing 1.625"
C/bore dia. 0.437"
C/bore depth 0.260"
9th May 2015, 08:28 PM
stix012

OLM 528

Dia. 3.235
width .750
Bore .750
Teeth 47
Mounting hole .265
Spacing 1.625
C/bore .407
c/bore depth .297