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How fast is fast enough

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Jon Lawes21/12/2021 15:23:52
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1078 forum posts

That looks superb Jason. Engraving like that is a capability I really wish my workshop had.

John Haine22/12/2021 10:40:20
5563 forum posts
322 photos

img_1069.jpg

I engraved these for a member here for a Tich. Used a 1mm endmill at ~5000 rpm and took ages. More recently have been making small steel pinions...

pxl_20211204_112143929.jpg

Profiled on the end of an FCMS bar and then parted off. Again cut at 5000 rpm. I would much preferred to cut at 10k or faster, not for time but just so the cutter was more lightly loaded. When I started milling I ruined a lot of cutters I now realise by running them too slow and taking small cuts so they rubbed.

Vic22/12/2021 12:05:04
3453 forum posts
23 photos
Posted by Ian Newman 1 on 21/12/2021 02:56:02:

Hi,

It is interesting to read the views of people who find rate of removal of material an important issue (or at least a consideration).

As I stated in my earlier post, I do not consider a slow rate of material removal to be significant - I am not in the business of making large production runs, I make models as a hobby, as relaxation and entertainment. Consequentially, almost everything I do is a "one off" and so I find I spend a relatively small percentage of my time actually machining.

When considering milling jobs, I would estimate I only spend about 10% of my time actually cutting material. The other 90% is spent on the following tasks (in decreasing order of percentage time consumed):

1) Making/reading drawings and thinking about how I'm going to do the job

2) Setting up the job on the machine

3) Marking out

4) Digging out the required material and tooling

5) Cleaning up and putting stuff away

A further issue for me is that I frequently find I need to make some sort of custom jigs/fixture to hold the part I actually want to work on. Designing and making such items can often take longer than making the part I actually want....

Given all of the above, being able to remove metal at twice my normal rate would have minimal impact on my overall 'production rate'

All the best,

Ian

I concur Ian. Like you I’m a model engineer removing metal for fun, not for profit. The top speed on my VMC is 2150 rpm but I’ve never run it at that speed.

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