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3 - Jaw chuck on Clarke 300 lathe / cutting speeds for brass / steel.

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Chris machin	12/02/2012 22:10:54
59 forum posts	Hi All , My clarke 300 is fitted with a 3 - jaw chuck and i have tonight taken out the jaws to see if they can be fitted as external jaws to give increased work holding capacity. It appears not so my question is are external jaws avilable and where do i get them ? Also can someone tell me a general speed for cutting / facing both brass and steel. I have tried facing brass tonight and seemed to get a good finish around 2000 RPM , Is this a good general speed for brass. As yet i haven't tried any steel cutting. Many Thanks Chris.
Ketan Swali	12/02/2012 22:23:24
1481 forum posts 149 photos	The outside jaws are supplied with the machine. Look in your bag of bits.
Chris machin	12/02/2012 22:31:33
59 forum posts	Hi , I Bought the machine second hand and there are no other jaws with it .Hence wondered if they can be purchased seperately ? Thanks
michael burton 1	12/02/2012 22:57:05
126 forum posts 32 photos	hi chris go to your local machine mart if your in the uk and they will be able to get them for you you may be able to get them if you phone there help line or service centres Tel: 0871 410 1270 Email: [email protected] thats the contact details for the spare part centre hope to help mikey
Chris machin	12/02/2012 23:10:28
59 forum posts	Thanks for info Michael , I'll give it a try
colin hawes	13/02/2012 16:17:33
570 forum posts 18 photos	The speed for cutting a metal bar depends on its diameter and material.Also the rigidity of the machine. Using HSS tools on mild steel ,about 700 rpm would be ok for 3/8" to 3/4 dia 500 rpm up to1" dia but cutting the larger sizes you should use a cutting fluid of some sort to maintain tool life and finish. 50% higher speeds for brass and aluminium. Note that, without lubrication, aluminium tends to weld itself to the tool causing a torn finish. Smaller diameters will be cut at proportionally higher speeds. I hope this gives you a good starting point! Of course ,you can't achieve ideal speeds when facing the end of a bar because its diameter is not constant. Colin.
Russell Eberhardt	13/02/2012 20:00:25
2785 forum posts 87 photos	Best cutting speeds depend on many factors. There are tables of recommended cutting speeds in M/min or ft/min but these are just a rough guide. If a certain speed works for you for a given job stick to it. Your speed of 2000 rpm for brass would be fine for up to about 3/8 diameter. You will probably need to reduce the speed proportionally for larger diameters. Russell.
Joseph Ramon	15/02/2012 14:13:53
107 forum posts	As you can vary the speed continuously you can change it if the tool is struggling or you get chatter. You will learn more and get better results by experimenting this way than by using calculated speeds. The right speed for a job depends on tool shape and sharpness as well as work diameter and material. You will be surprised how being able to change the speed helps you learn and how little you change it once you get used to the lathe. Joey
Russell Eberhardt	16/02/2012 09:00:23
2785 forum posts 87 photos	Agreed, the published tables are mostly for industrial use where the machines and tools are more rigid and speed of production and tool life have to be weighed off against each other. For hobby use with less rigid machines the requirements are different. The tables can, however, be used as a starting point. Russell.
Ian S C	16/02/2012 09:33:43
7468 forum posts 230 photos	One you missed Russell, coolant, in industry the cutting fluid goes on in liters a miniute, enough to cool the work to ambient temperature while it's machined at high speed, and big cuts. The lathe is completely covered in, its a completely different world from ours. Ian S C

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