Printable View
Hi fellow makers,
Made this little number a while back, got sick of winding back the compound to adjust angle to do simple taper or bevel. When I road tested it I had real trepidation that this is going to end badly but works well. Even finally after designing a better compound angle system still use it often for tight or small tasks and no winding required.
cheers stevoh
Attachment 24410
Attachment 24411
Attachment 24412
Attachment 24413
Very Good
Doug
Thanks doug, im slowly posting stuff I've made. Had a unimat 3 for 20 years and decided wanted to do bigger projects, hence the struggle with the chinese mini lathe shortfalls. Bought in mid 2015, then came across second hand but still new mini mill in jan 2017 for good price. Still learning but enjoying challenges. Cheers
What is the purpose of the slide? I can see that when threading but not tapers/bevels.
Very nicely made.
Ralph
Stevoh
Very nice and great idea. Threading would out very well. and any small cut at any angle you set it at, the only draw back would be the depth of cut.
Nice work
Nelson
Thanks ralph, the whole idea is to make a cut on an angle just by sliding the cutter into the material simply by pushing then pulling the handle rather than using the compound slide, hope this makes it clearer,
Regards stevoh
Thanks nelson, travel on slide is 13mm, depth of cut or the amount of material removed on a pass depends on type of material. Brass & aluminium cuts effectively with no chatter, I've sometimes cut up to 1mm in one pass. With steel I tend to be less aggressive.
Regards stevoh
Excellent use of mechanics, ratio of lever to handle length produces good hand-fed finishes, and round tool bit gives best clearance for light work. You can grind a separate parting bit for thin wall work too.Quote:
Originally Posted by Stevohdee
I'd be tempted adding a return device by pneumatic or spring, but making this an engine lathe tool is brilliant. Variations are almost exclusive to turret lathes.
Thanks toolmaker 51, now ya got me thinkin, hmm, could have used quick parting tool recently & spring return? Hmm, great input, have thought about increasing travel somehow.
thanks
Stevoh
Stevohdee,
Great idea and well executed!!! The tool is solid, compact and not complicated by unnecessary features such as dovetail slides, etc. I love it's simple form and function. I am wanting one for myself.
Thanks dick for your comment, much appreciated,
regards
Stevoh
Most lathe hands will state parting their least favorite task. Added [excess] travel puts greater deflection on the extended bit...not a happy time for parting tools.Quote:
Originally Posted by Stevohdee
Narrowing effective [cutting] width reduces it...That explains why parting tools have a tall profile in comparison to width. The round bit has great clearance without the support underneath.
The round bit is used in milling too, called a "D" bit; initial clearance provided by grinding upper edge past centerline.
Yep, you're right, parting tool out of the question... Unless whole unit moves with tool... Back to the drawing board!! Thanks again
That sounds like a natural development; anchoring pivot side so tool and holder move together, minimizing unsupported tool.Quote:
Originally Posted by Stevohdee
Your square-tipped bit is efficient, proven by plunging into solid material. Your tool may or not part well in every case, depending on material, depth and proper grind. It should perform 'necking', which is parting without full penetration. Also, there's a process to relieve inside corners; plunging in a short distance at 45° so perpendicular surfaces accept flush mating parts.
Attachment 24453
Such a cutter needs back clearance on each side, eliminating a jam in the narrow groove. A tiny radius will blend surface marks, helping avoid a jam.
To chamfer open corners, a small radius on each side of bit will reduce [blend] tool marks of hand-fed cutter movement....As only one face is cutting, the extra contact shouldn't generate too much load on the tool.
<!-- BEGIN /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->
Thanks Stevohdee! We've added your Bevel Tool to our Lathe Accessories category,
as well as to your builder page: Stevohdee's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="http://www.homemadetools.net/homemade-bevel-tool-2"> <img src="/uploads/215190/homemade-bevel-tool-2.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="http://www.homemadetools.net/homemade-bevel-tool-2">Bevel Tool</a> <span> by <a href="http://www.homemadetools.net/builder/Stevohdee">Stevohdee</a></span> </div> <div class="tags">tags: <a href='http://www.homemadetools.net/tag/bevel'>bevel</a> </div> </div> </div> </div>
<!-- END /var/www/html/homemadetools/protected/modules/zeus/views/tool/postUpdate.php -->
Thanks Steve,
Really a good idea, I think at a Tripan version of your tool with your permission.
Have a nice day.
Pierre
Hi Pierre, thanks, no permission needed, look forward to seeing your version
Cheers stevoh
Thanks,
If you're interested, here is the page with the Tripan customisation I made. ;-)
Thanks for the link, much appreciated
I found the link to various Tripan holders interesting too. Best [so far, there's a bunch!] may have been the sphere generator. I suppose it's linked to swing of particular lathes, but rotating on horizontal axis seems far more ergonomic. Naturally avoids tailstock interference better, not everyone has 4' [1200mm] of bed to park things out of the way.
The off-lathe height setter is very clever. You'll see right here on HMT.net, all manner of interpretations achieving cutters on center, ALWAYS dependent on being in the lathe first. OK, logical enough but following the lead of how QC mill tools are preset, I don't recall ever seeing lathe tools handled this way. Very good idea Okapi!
Some holders were harder to visualize their intent, such as 2 parallel dial indicators [jpegs "Tripan14-17]. Care to describe or illustrate that in use?
It appears you select French language for your site, does that mean you are in the western linguistic quarter of Switzerland?
Hi Toolmaker,
Yes, I'm living in the french part of Switzerland, about 40km. from the factory of Tripan toolholders which gives you a good idea why I use that system especially. ;-)
For the parallel dial indicator, I can make pictures in use for a better illustration.
The support for the tool height has two positions on the brass gauge you see because I use it for two different lathes with the same equipment in Tripan series 1xx
For the sphere generator, I have make different types, this one is made especially for small radius, and for a fastest use than a horizontal one, the horizontal gives more possibilities but need to take away the superior part, then consuming more time for just one radius to make.
Have a good day.
Pierre
Pierre;
I'm loosely familiar with TriPan, yet they aren't prevalent here. Aloris wedge style is common on large lathes, KDK on medium but I don't understand the justification. Some of the BIG machines had Dickson variety and I feel they are most solid when it comes to resisting forces required to make metal fly.
.6 [15mm] or .7 [18mm] deep at .04 [1mm] per revolution proves cutting tools quickly as holders.
Crossing paths with TriPan occurred in a toolroom annex making drill bushings. I was called to verify set-ups and repeatability on Levin watchmaker lathes, they all had completely interchangeable TriPan holders. That way an available operator could run whatever job seamlessly. TriPan is the king on that variety of work; no question.
The Swiss 40 Station is real nice too, acres of engagement between holder and post.
Seems I've used every QC and turret post made at least once. That initiates comments below.
My toolholder collection is all second hand usually by auction, hand selected. Have amassed a collection to suit different types of parts. The only KDK is a holder, no post, a six station turret! It might be a prototype/ sample. As the 'nets expanded I might find other examples, but no ones ever seen one like it. I made a 'adapter' to grip it's Vee vertically and a horizontal section for common holders [3/4"]. Indexes with a levered latch and plunger. Just like a tailstock turret. Repeats in the .0002 range when central axle is wet with boat trailer grease. Boat trailer grease by the way is water resistant [duh] for the wheel bearings, therefore not affected by water based coolants.
Not to demean KDK but proportions of larger holders just don't jive with their narrow Vee...but I'm just one guy.
Along the way after your site with all the holders, someone asked about lever torque on wedge-action holders versus repeatability...Most critical are clean mating surfaces. next is a film of fine oil on the female wedge; less resistance to camming action. Reasonably consistent torque is sufficient. One could use torque wrench or limiting extensions for greater infinite repeats of 1=1.
No cost effective manufacture process assures perfectly reliable positioning; size control, internal friction, surface finish and of course durability. Employee maintenance, forget it. When a guy BUYS it that all changes.
