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: Machining Ball Screws Accurately|
Hi Michael, thanks for replying.
I'm only wondering how much better it would be possible to achieve.
The wire sits at the bottom of the thread (ball track if you like) and because the wire is of uniform diameter it makes an even offset from the bottom of the thread. Once it's gripped in a collet or good chuck then I think the method stands every chance of holding the part concentric to the thread itself.
All that said, I'm sure a ballscrew can simply be held by its outer diameter and machined as required without worry as long as the chuck or collet is good. All the ballscrews I have had to machine have needed straightening before machining and that can be a faff in itself.
Can anyone say why it needs to be more complicated than I have already suggested?
When I machined some ballscrews a while ago, I think I found a suitable spring and wound it along the thread - a bit like a Helicoil. As the spring sat higher than the peak of the ballscrew I was able to grip the spring in the jaws of a good three-jaw chuck and so machine the screw.
Something like this:
Wind some wire around the thread and and grip the wire in a collet. The wire diameter should be slightly greater than the thread depth.
|Thread: ACME versus Square thread profiles|
Trapezoidal threads allow half-nuts to engage whilst not fully in alignment along their length.
|Thread: SDS. What is it?|
I don't know for sure, but I think SDS drills hammer at a much lower frequency and each hammer blow is much more powerful.
|Thread: Rack, pinion and gears.|
For similar situations, it's usual to power the leadscrew and let the spindle follow.
It seems like you need to cut a thread of 9mm pitch.
Do you have access to a lathe, Ronen?
Edited By blowlamp on 06/11/2020 10:49:45
|Thread: Soluble hard varnish that sticks tightly to metal?|
Would epoxy paint followed (after polishing) by paint stripper work for this task?
I found Wllko own brand paint stripper to be very effective againgst some Rustoleum twin-pack paint, which was quite abrasion resistant.
|Thread: Rubber mat.|
Machine Mart has rubber matting on the roll, in several thicknesses and surface patterns.
|Thread: New Covid Rules|
"As many as 700 potentially spreading the virus in Bristol and the surrounding area. 700 that simply do not care."
The strange thing is Mrs Blowlamp is back to school tomorrow, where there are over 700 pupils and more than 80 members of staff!
Edited By blowlamp on 01/11/2020 19:34:48
Edited By blowlamp on 01/11/2020 19:36:02
It's strange as this video seems to show people are keeping their distance.
Stay safe, trust the government, don't leave your bubble.
|Thread: Gib Screw Locking Methods|
When I made an improved cross slide for my Starturn lathe I made the arrangement as shown in these two pictures.
I made pushrods with combined dowels and angled faces to give better support to the gib strip. I think I applied some superglue to the threads of the grub screws and let it set before fitting them, to make them self-locking.
|Thread: For the latest in PC fashion! (Anyone here with a Master's Degree?)|
Thanks for that... I only knew about the egg & spoon, three legged and wheelbarrow!
If it gathers pace then Jaeger-LeCoultre will need to change their range.
Does anyone know the names of the different races?
|Thread: .DXF Files for Meccano Chain Wheels|
A way to find the centre for the tooth flank radius of 0.125".
Here's mine in MoI.
|Thread: DRO errors, or are they??|
If the unlocked cross slide was moving whilst taking a cut, I would expect the DRO reading to fluctuate too.
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