scottmk1
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Well, I got myself a Harrison M300, 1000mm between centres & it's in need of a proper rebuild.
I think the bed etc will be off to Slideway Services for a regrind once I have finished stripping it & I'm looking to replace quite a few parts like feed screws & nuts, a few of the control knobs and seals/gaskets where needed.
The head runs nice & quiet so I'm hoping that it doesn't really need any new parts however I will give it a good clean out.
The first thing I want to attend to is the cross feed screw & nut. Mine is worn to the point that the crown of the thread is pointy! The adjusting wedge for the nut is missing & can only assume that the threads in the nut are goosed too. The micrometer dials are the dual imperial/metric type, these have been well abused & basically I think they are scrap so I might look into getting plain metric ones. The lathe has a DRO fitted so that takes care of any conversion stuff.
So, what material is most suitable for making my own feed screw? I have plenty silver steel, although I will need to check length, and I have another lathe to use for turning & screw cutting. If silver steel is no good, what is? What about the nut, would a one piece nut do the job or am I going to have to make a 2 piece nut with a wedge as per the original? The top slide screw & nut will probably be the same so that will receive the same treatment.
Pics to follow once I've tidied up the workshop!
I think the bed etc will be off to Slideway Services for a regrind once I have finished stripping it & I'm looking to replace quite a few parts like feed screws & nuts, a few of the control knobs and seals/gaskets where needed.
The head runs nice & quiet so I'm hoping that it doesn't really need any new parts however I will give it a good clean out.
The first thing I want to attend to is the cross feed screw & nut. Mine is worn to the point that the crown of the thread is pointy! The adjusting wedge for the nut is missing & can only assume that the threads in the nut are goosed too. The micrometer dials are the dual imperial/metric type, these have been well abused & basically I think they are scrap so I might look into getting plain metric ones. The lathe has a DRO fitted so that takes care of any conversion stuff.
So, what material is most suitable for making my own feed screw? I have plenty silver steel, although I will need to check length, and I have another lathe to use for turning & screw cutting. If silver steel is no good, what is? What about the nut, would a one piece nut do the job or am I going to have to make a 2 piece nut with a wedge as per the original? The top slide screw & nut will probably be the same so that will receive the same treatment.
Pics to follow once I've tidied up the workshop!