How can I keep a deeply drilled hole straight?

[SillyOldDufferModerator @sillyoldduffer]

Managed to measure my tailstock misalignment. It's 'as delivered' by the supplier – I've never adjusted it since new.

Using this method the spindle centre and a half-centre clock nearly 0.02mm out with the ram protruding 60mm.

Measuring deviation over distance, the ram travels 0.035mm down and 0.08mm right over 80mm.

My DTI is a 0.01mm type. All the measurements are rounded up to the nearest 0.005 guesstimate.

For what I'm doing, a straight rather than an accurate hole, the alignment figures feel 'good enough'. Am I right or are my tailstock alignment figures scary bad?

Ta,

Dave

Edited By SillyOldDuffer on 15/09/2017 17:08:59

[Neil WyattModerator @neilwyatt]

See if there's paint or crud between the two parts, especially at the back tilting it forwards.

The L/R error is easy to introduce when adjusting back and forth, and rather fiddlier to get rid off but it can be done.

Always clamp it with 'normal force' before making a measurement.

Neil

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