Myford ML7. K81121R

[eurwyn willamsParticipant @eurwynwillams34467]

This old but well reconditioned lathe has a problem , or maybe it's my inexperience that's showing?

My problem is that when drilling into a delrin bar held in the chuck, the drill tends to snatch, it tends to get drawn into the bar. There appears to be longitudinal play in the barrel thread. The thrust plate is a nice tight fit into the body but there is a slight play in the groove of the shaft into which it fits. The handwheel is also loose on the threaded area of the barrel which allows the barrel to move which I think may cause the snatching.

I don't know if this is normal longitudinal play that one would expect, I'm guessing that it is between 2 and 5 thou. Otherwise the barrel fits snugly in the body without any lateral play at all.

Do I need a new part?

Any advice appreciated

Eur

[eurwyn willamsParticipant @eurwynwillams34467]

Tailstock problem

[JasonBModerator @jasonb]

If its been working OK on metal you may want to try a slow spiral drill bit which will be less likely to be pulled into the plastic rather than fiddle about with the tailstock.

J

[John Stevenson 1Participant @johnstevenson1]

Get a honing stone and give the front of the spiral a quick run rub to change the angle to be more vertical.

This will stop a drill snatching in plastic and brass.

 

[edit ] changed run to rub – this damn keyboad can't spel to save it's life. ]

Edited By John Stevenson on 23/02/2014 12:56:03

[NobbyParticipant @nobby]

HI Eur
 Same as John says but you can Grind the rake ankle so that its flat. with on angle use like this for brass as well
Nobby

Edited By Nobby on 22/02/2014 23:09:48

[roy entwistleParticipant @royentwistle24699]

Hi all Can one still get straight flute drills ?

Roy

[John Stevenson 1Participant @johnstevenson1]

Would image so but at a cost.

Try Drill Services in Chorley, they seem to be the only specialist left in this game.

[roy entwistleParticipant @royentwistle24699]

Thank you John I think you mean Horley not Chorley and they don't seem to have them on their website

Roy

[Author]

Posts