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Member postings for blowlamp

Here is a list of all the postings blowlamp has made in our forums. Click on a thread name to jump to the thread.

Thread: Alibre Pro / Expert and AlibreCam
12/10/2020 12:29:03

Which level of Alibre CAM are considering, as there is a large difference in price & features between the options?

Martin.

Thread: DHL Rip Off
11/10/2020 20:08:10

Rip offs are everywhere.

Thread: Home Automation Technique
10/10/2020 15:03:29

..."Measuring temperature is important for calculating the relative humdity. However, theoretically I need the absolute humdity level to decide whether to start pumping air. And the temperature inside and out will be approx the same and only varies from 25 degC on a cool night to 35 degC on a hot day. So basic humidity is all I need."...

If you need a humidity sensor device, then I can confirm that is what I am using in the form of a Sonoff TH10 (plus the sensor).

The eWeLink app allows me to select temperature or humidity. I have it set to switch on my bathroom fan when humidity reaches 75%. and off when below this figure.

It's been working quite reliably for over a year now and still functions without a network connection once it has been programmed.

Martin.

09/10/2020 14:34:34

I use one of these to control an extractor fan in my bathroom.

Martin.

Thread: How to identify climb milling?
02/10/2020 17:26:44

Also be aware that milling a pocket reverses the climb/conventional direction of travel when compared to milling the outside of a pocket.

Martin.

Thread: Quality Problems With the Sieg sx2.7
01/10/2020 19:33:26
Posted by Ketan Swali on 01/10/2020 18:06:45:
Posted by blowlamp on 01/10/2020 17:00:13:

I don't understand the logic of this argument. thinking

How did Colchester, Harrison and all the other machine tool manufacturers manage to export their machines abroad without them losing precision question

Martin.

Hi Martin,

There is no logic to argue, but I really don't expect a person with your level of compitance to understand. wink

Ketan at ARC.

Edited By Ketan Swali on 01/10/2020 18:10:49

Edited By Ketan Swali on 01/10/2020 18:11:12

Hi Ketan.

Is this meant as a joke or an insult?

Martin.

01/10/2020 17:00:13

I don't understand the logic of this argument. thinking

How did Colchester, Harrison and all the other machine tool manufacturers manage to export their machines abroad without them losing precision question

Martin.

Thread: Covid causing mental health issues.
28/09/2020 19:36:28

As we've been told, this virus isn't ever going away, so we're going to live like this forever.

We need to embrace new ways of communicating without the need for embracing physically.

Be kind, be strong, cling on. tea

23/09/2020 11:25:10
Posted by Rik Shaw on 23/09/2020 10:58:29:

I'm usually quite good at staying cheerful - then I read this thread kulou

Rik

I'll cheer you up! rainbow

Nothing like some music & dance to lift the spirit. yes

'Staying apart brings us closer together'. rose

Martin.

Thread: Changes to Fusion 360 Terms
19/09/2020 11:56:09
Posted by Neil Wyatt on 19/09/2020 10:40:23:

I have been told some very interesting news for anyone who wants an integrated 3D CAD/CAM solution but I can't say more... yet!

Neil

Unless it's very exceptional integrated (expensive) software then I tend to find one side is better than the other.

Because of that, I have gone down the route of finding a CAD system I can get along with, and secondly having a selection of CAM systems that have strengths in various areas, because I haven't found one that does, or is strong, in everything.

However, I'm certainly interested in what you have to show us.

Martin.

19/09/2020 11:41:31
Posted by JasonB on 19/09/2020 07:14:37:

I could live without the rapids as I don't have the max on the KX-3 set that high and if using "both ways" cutting when roughing out at least you are removing metal on he return cut. The multi axis "steep and shallow" would be missed as I do a fair bit of work that has compound curves and it's the ideal finishing tool.

Not having a quick change tool holding system I already break the program down into what each tool can do and set the next tool height before running the next lot of code. This is fine for the one off things that I do for my models and as I usually only do a few hours a month on it not much of a problem as it would be when doing batches.

I'll wait to see how limiting I find the changes and then decide if I want to pay for what is really only the CAM side for me as I still design in Alibre and their CAM is expensive.

Occasionally, I have wrongly set something in CAM and produced gcode with long lead-ins or lead-outs... ...just that is painful to see in action, so don't underestimate how you might feel when one of your jobs has the tool jumping all over the place.

The other bad news is that the Steep & Shallow milling strategy appear to be for the chop in the free version come October.

Martin.

19/09/2020 00:14:32

I can't imagine being happy using my little CNC lathe without rapids. The thought of watching the tool endlessly trundle its way back to the start point of a long part at around 100mm/min feed rate, when I know it could easily zoom back at 1500mm/min is more than I could stand.

I've got Fusion 360, but I prefer to program my lathe with eCam, even though it cost €150.00 rather than being free. It seems like a reasonable purchase now, given this news.

Martin.

18/09/2020 11:37:58

From the Fusion 360 Website:

What does no rapid moves mean?

Removing rapid moves means that all toolpaths will use High Feed, where the maximum feedrate for linking moves is the cut feedrate. You can still decrease the feedrate of linking moves if you want but you won’t be able to raise the high feed value above the cut feedrate.

For those of you with small consumer grade machines, this will likely not have a significant impact on your total cycle time. If you have a large machine with a high rapid feed, the rapid codes will no longer be in your posted code.

That'll throw a spanner in the works for some jobs.

Martin.

Thread: Facing parallel between centres.
15/09/2020 11:55:18

The reason to do it between centres is that this way provides an intrinsically 'perfect' solution to the problem.

Assuming the lathe is facing-up correctly and the headstock & tailstock centres are in proper alignment with each other, then this should be a simple job.

I say it's a 'perfect' solution because it requires no setting up with gauges or other tools. Therefore, it can be removed and replaced at will, with no loss of repeat accuracy. The end faces are generated, which is a (theorectically) perfect way to create an object, as it isn't reliant upon things like exact tool geometries or how precisely the tool is aligned to the job.

In contrast to face milling the ends, you would have to be sure the milling spindle axis is set exactly perpendicular to the table movement as well as ensure the table working surface is flat and perpendicular too. The effect of any inaccuracies would reflect in the job by faces not being parallel or slightly hollow due to spindle misalignment.

Martin.

14/09/2020 12:08:45
Posted by Martin Kyte on 14/09/2020 11:57:51:

parallel faces that are faced slightly concave

I object to the description of parallel being applied to anything other than lines or flat planes. Parallel planes have rotational and translational symmetry.

I'm perfectly happy to describe the periphery of the two ends of the cylinder as being parallel when concave (or convex) by not the face.

regards Martin

How about 'evenly spaced' or just 'offset'?

Martin.

14/09/2020 10:45:34

So am I correct in thinking that you started this thread after you had actually completed the jobquestion

Martin.

Thread: New Covid Rules
13/09/2020 19:29:08
Posted by Graham Swales on 13/09/2020 18:13:46:

One last time. What does your Covid specific risk assessment have to say?

If the answer is "we ain't got one" then I suggest your problems are greater than worrying about 6 and out!

Graham

Do you mean with regard to wearing a mask? If so, you should be able to use the government risk assessment.

Remember: noyes disgust female<<<<<<<<>>>>>>>>male

Martin.

Thread: Facing parallel between centres.
13/09/2020 12:16:25

Assuming the part has been fully roughed out and now only needs the finishing cuts, this would be my checklist:

 

1/ Ensure the lathe is facing square & flat:

Do a light facing cut on some (scrap maybe?) material mounted in a chuck and place a straight edge over the face to ensure it's been machined flat or slightly hollow. This is desirable to prevent rocking when assembled to the milling machine.

 

2/ Ensure the lathe cuts parallel between centres:

Machine the length of some bar (between centres) to see if both ends come out at the same diameter. If not, then adjust the tailstock until they do.

Note. If your facing cut gave a slightly humped result, you could compensate this out by setting the tailstock over towards the operator to make the lathe cut a slightly smaller diameter at the tailstock end. Doing this will tend to make facing cuts hollow too.

 

Now the lathe is set up properly, mount the job between centres. Face & turn to diameter (at the tailstock end only), then swap the job end for end and repeat.

 

 

Martin.

Edited By blowlamp on 13/09/2020 12:18:57

Edited By blowlamp on 13/09/2020 12:19:44

13/09/2020 00:27:11

Are you talking about the top and bottom (end) faces being out of parallel or a variation in diameter between each end?

If it's the diameters that differ, then you need to adjust the tailstock to correct the slight error you have. However, if you can reverse the workpiece end for end between cuts at the tailstock end only, then you should be able to get a better result, as long as you don't disturb the cross slide setting between those cuts.

How is the parallelism over the 4" length?

Martin.

Thread: New Covid Rules
11/09/2020 14:18:09

Thanks, Dave, for confirming I hadn't missed anything in the T&Cs. What's 'The Tea Room' for then?

Whilst on the topic of do's & don'ts, I ask moderators to be more aware of casual racism in some peoples posts with regard to how they sometimes refer to products made by the population of China. This is done as if they are intrinsically inferior by virtue of the nationality of the people that made them, rather than the fact they are made to be more affordable - that is, down to the price demanded by the seller.

Martin.

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