Pultra thrust bearing

[david bennett 8Participant @davidbennett8]

Most Pultra 1750/70 lathe headstocks seem to have ball-race thrust bearings.Occasionally I come across a thrust bearing that is a solid hard steel thrust collar splined to the spindle shaft. Does anyone have more info such as- is it just an early version? I have seen a suggestion that it may be for the high speed headstock.

[david bennett 8Participant @davidbennett8]

Unusual type

[DellParticipant @dell]

My understanding is the early Pultra had solid thrusts and later ones had ball thrusts.

Dell

[david bennett 8Participant @davidbennett8]

Posted by Dell on 02/11/2022 08:50:10:

My understanding is the early Pultra had solid thrusts and later ones had ball thrusts.

Dell

Thanks Dell. Just to clarify, you are referring to the early 17-series? I know the "P" type all had solid thrusts.

Dave

[DellParticipant @dell]

Posted by david bennett 8 on 02/11/2022 17:04:10:

Posted by Dell on 02/11/2022 08:50:10:

My understanding is the early Pultra had solid thrusts and later ones had ball thrusts.

Dell

Thanks Dell. Just to clarify, you are referring to the early 17-series? I know the "P" type all had solid thrusts.

Dave

Yes 17/50 17/70 not sure about the 15 series though also don’t know when the change happened, my Pultra is post WW2 and it has ball bearing thrust.

Dell

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