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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: Acceptable runout on mill
07/09/2011 17:13:21
You want it as close to zero as possible.
I wouldn't be very happy with 0.004" near the chuck.
Thread: Calculating Feed Rate using Myford G-box
05/09/2011 12:34:54
In my opinion, David's glamour shot is much more provocative.
Thread: MEW 181 (Scibe a Line)
03/09/2011 15:21:07
I don't think Sketchup is ideal for 3d technical drawing such as an engineer would need because it's a Polygon based modeller rather than NURBS based.
This means that circles and arcs etc, are made up of short straight line sections and not proper curves, so they're only a representation of the real thing i.e. everything is faceted.
On the other hand, NURBS is mathematically precise modeling, which is what you really need for engineering.
You've also got to learn two CAD applictions and is one of the reasons I decided to pay for my software, despite the free stuff being available.
03/09/2011 12:58:18
Did you ever try ViaCAD2d/3d?
It's one of the few good CAD applications that are available on both PC and Mac and is updated frequently.
The problem for me with the free 2d software from the big companies, is that once you're ready for 3d, you've already been 'conditioned' towards that firm's product - and they certainly aren't free.
John's right about CAD and religion, but if you do need 2d and 3d capability, then there doesn't seem to be many affordable options out there for the hobbyist.
Thread: Reaming a pinion, wall thickness?
02/09/2011 11:54:22
Let us know how you get on.
02/09/2011 11:45:47
Tell us what equipment you have access to, such as lathe, collets, chuck and drills etc.
You can drill in stages of 0.1mm if your tools are OK - you could even bore that pinion in the lathe, but it depends on your skill and equipment.

Edited By blowlamp on 02/09/2011 11:48:15

02/09/2011 11:12:35
Posted by pgrbff on 02/09/2011 10:24:40:
Thank you.
When I was browsing reamers there was a large difference in cost. Will spending more make the job easier or will the more expensive reamer simply stay sharp longer?
Will a hand reamer do in a lathe, or do I need some other type?
Should the steel prove to hard, what symptoms will I observe, so that I know to stop.
Arceurotrade have the 6mm reamer you need for less than a fiver.
As I said in my previous post, just test the hardness by seeing if you can scratch the pinion bore with a file or scriber etc. If the tool skids along the surface without starting to bite, then it's going to be too hard to cut with a reamer. No need to press hard when doing the test, as a sharp tool will cut without undue effort.
02/09/2011 08:39:05
The question has been answered. If it's soft enough, put the gear in a collet and drill/ream it. You can test with a file or scriber on some unimportant area to see how hard it is and if either of these tools skids over the gear, then it will probably have to be ground.
Do you think one of the Loctite products would help to hold the gear in place?
Thread: Myford S7 Spindle Nose / Chuck fitting.
30/08/2011 22:07:11
My advice to anyone making their own nose fittings such as backplates and collet chucks for lathes with Myford style spindles, is to make the bore and abutment faces that are near the threaded section, as clean and accurate as they can, because they are the designated alignment surfaces for location of such equipment.
The diametric accuracy of the thread is of secondary importance and should be made with a little slack, to allow the register to do its job of pulling the chuck into alignment with the spindle.
30/08/2011 12:09:38
Myford were always very fussy about the faces of the register of the spindle and I doubt they would have let anything out that wasn't close to being bang on to size.
I wonder if the 0.0005" taper is due to wear from fitting and removing chucks over the years, perhaps without a spot of oil?
Thread: Proof reading, what proof reading ?
28/08/2011 14:46:08
Posted by Andrew Johnston on 28/08/2011 14:31:37:
In response to Ady's picture all I can say is 'quack quack'. I'll leave it to others to work out why that is appropriate.
Thread: Milling spindle
27/08/2011 11:54:09
I'm assuming the spindle is fully contained by its housing, apart from access to each end of course.

Putting a pair of spherical bearings at the front end of the shaft isn't going to bring you any benefits in my opinion.

For the whole assembly to work, you've got to pre-load the bearings to ensure there isn't any play.

Looking at your drawing, it seems like you intend to pre-load the spherical bearings against one another and have the back bearing find its own axial position as well as provide support against the tension of the drive belt.

If I've got that bit right, then it would appear that you will only be utilising half of each of the spherical bearings rolling elements i.e. those that are pulled into contact through pre-load.
This is the same situation that you would have if you were to use two taper-roller bearings mounted back-to-back.
If you increased the spindle size to 35mm you could fit a beefy 32007 bearing @ 35x62x18mm at the front of the shaft to take most of the load and a another taper-roller in the 25mm I/D range (a bit larger if possible) for the back bearing, thus allowing for adjustment of pre-load.
Keeping the spindle at a nominal 35mm along its length will keep it rigid and save machining time.
Access to the preload adjusment also looks as if it would be more convenient as it would be just under the drive pulley.

Edited By blowlamp on 27/08/2011 12:04:07

Thread: Time for reflection
26/08/2011 23:57:29
Posted by alan frost on 26/08/2011 23:43:15:
What on earth is this lot about ? Is Charlie the only one without a handbag ?
Dunno, but he'll probably tell us when he's done his ironing
Thread: Milling spindle
26/08/2011 17:56:01
Sorry, I wrote plain roller bearings in my last post when I meant to say spherical.
The only advantage I can see to the spherical bearings is their self-aligning properties, but that could work also against you if the spindle isn't absolutely rigid.
A pair of lightly pre-loaded taper-roller bearings at the front end of your spindle would form a very stiff assembly - which in itself would probably be overkill
I look forward to seeing your drawings when you get them uploaded.
26/08/2011 16:54:45
You could get a pair of 30206 taper-roller bearings in there that would be more rigid than the plain roller bearings you are proposing.
What about a quick sketch of your proposed design for us to look at?

Edited By blowlamp on 26/08/2011 16:55:15

Thread: Time for reflection
26/08/2011 00:27:13
Which thread has been closed today?
Lots of threads in forums have heated conversations, but in general I find it best if the moderators lie low and let things resolve themselves naturally if possible.
If there's one thing that's likely to fan the flames, it's when one parties' opinion is censored at the behest of someone that claims to have been insulted, injured, or traumatised.
This isn't to say that we all sit and watch a fight to the death, but most people contribute because they feel they have something of value to say and simply don't appreciate having their view being erased as having no merit.
I believe that when an individual puts his work or opinions before the public, he does so with the understanding that they will be his judge and accepts that he may receive criticism as well as praise. It also follows that matters that are considered by some to be side issues, are brought into the conversation.
Thread: Commercial projects???
25/08/2011 15:51:39
Deleting threads like this one means that no one can refer back to it, so it just leaves the door open for the same things to be said all over again.
I say leave it and when a similar issue arises, it's a simple matter to direct people here. The plus side is that other threads don't get overlooked whilst the same battle is played out for a second time.
Again, just my opinion.
25/08/2011 12:32:25
I'm finding it very difficult to walk on the eggshells that are strewn around here and feel that It's almost impossible to know which way others are going to respond.
How frustrating to have a forum where ideas and opinions abound, only to have them crushed by those that don't want to hear them, because it doesn't suit them.
My opinion, to which I think this thread relates, is that it's not appropriate for a Former Member to have announcements made here, of forthcoming articles somewhere else, as it amounts to free advertising and is an abuse of the goodwill of the service providers here.
However, after publication, I think it would be entirely right to discuss the matter freely, anywhere.
It's just my opinion.
24/08/2011 19:50:49
Posted by John Stevenson on 24/08/2011 19:39:51:
Posted by David Clark 1 on 24/08/2011 19:07:31:
Hi David

I will go and delete all of Graham Meek's details about his screwcutting item being published comercially in a competing magazine.
(When I have had a cup of coffee.)
Thank you for pointing this out.
regards David

Edited By David Clark 1 on 24/08/2011 19:12:43

Careful, That may backfire when people go to buy the 'other' magazine to read Graham's article and perhaps find they like that mag in preference.
John S.
If they want that particular article, then they've got to buy the other magazine anyway, haven't they - or is it going to be reproduced on this website?
Thread: deleting old thread
22/08/2011 12:10:14
I know that emoticons aren't to everyones taste, but I see them as a kind of insurance (or reassurance if you want), that when an argument is being firmly put - in this instance, using all capitals - they portray the sentiment intended by the writer.
... but really.
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