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Re: Heavy 10 gearbox
开云体育??? ??? You might also ask over? here Lots of South Bend knowledge over there animal On 7/3/23 6:05 PM, bill tober via
groups.io wrote:
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Re: Heavy 10 gearbox
Hi group, Over the years now in then I need the use of my wide rangedouble tumber gear box for cutting screw threads. The problem is I do not have rotation to my lead screw in? E,F,G speeds only A -D speeds. Could it be a broken key in the 3large power gears? I read some where only the first 2 large gears are keyed.Need your thoughts Bill |
Re: Adapted a 9” steady rest for my 10L
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Re: Adapted a 9” steady rest for my 10L
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On Jun 28, 2023, at 11:51, tk_1971 via groups.io <tk_1971@...> wrote:
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Adapted a 9” steady rest for my 10L
Like others before me, I found it difficult to find a steady rest for my Heavy 10. Without any fiddling ( just dropping the 3 telescopic pieces down), I can get +/- 0.001” with a 2ft long bar stock that I plan on making into a drawbar for one of my mills. |
Re: Cover for cross slide screw with TTA
开云体育And this time with pictures...
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Cover for cross slide screw with TTA
Evening all,
Please find attached 3 photos of a cover I recently knocked up for the purpose of keeping swarf out of the cross slide screw on the railway's 14.5" x 6' toolroom SB.? I have seen these illustrated on this group, and they look like a fancy piece of factory impressed metal.? Mine is just a piece of spare sheet left over from another job, maybe 1mm thick.? I folded a small flange on the edges to make it stiff.? The anti rotation feature is just a standard socket head cap screw, 8mm in this case I think, grade unimportant, with just a light shave removed from both sides with a grinder, and this is shown in the photo with the cover removed & inverted.? The pivot hole is not central (dimensions not provided - make it to suit your lathe).? When it runs out of travel, just reverse it.? I have proved that it covers the gap down which the bad stuff falls at all positions of the cross slide.? The 2 ends are ever so slightly panned upwards in order to ride up over the joint where the slotted piece meets the cross slide proper.? The inscription is simply because this is a common user lathe.? By heck, how you have to watch 'em! Cheers, Eddie |
Re: Parts for sale Not mine
Have to be a member of farce book On Sun, Jun 25, 2023 at 9:43?PM W.D.Bill via <Bthrottlemore=[email protected]> wrote: Wasn't somebody here looking for this? |
Re: Depth of cuts
开云体育Link belts used to be, and I assume still are, very stretchy indeed, when compared with a modern cut edge (and maybe notched) V belt, which have negligible stretch, and indeed, shrink in length if they get hot due to slipping (good feature, that one). On one hand link belts have the benefit that on such as a pillar drill with cone pulleys, you can stretch them enough to change speeds without slackening the adjustment. On the other hand, you cannot use them at anywhere near the power of a non stretchy one. Many years ago I tried to run a long link belt to drive a single cylinder compressor at low speed. It would only get over TDC for about the first 10 minutes after taking one or more links out. On that particular job, I gave up on belts as it was impossible to fit an endless one without taking the flywheel off an engine and fitted a chain drive instead. (For anybody interested, Dorman 2DWD engine in a 20/28 HP Simplex 2' gauge locomotive. The only available auxiliary drive is the pulley that normally drives the fan, mounted on the camshaft end, and tightly sandwiched between the flywheel and crankcase. I replaced the pulley with a sprocket to drive the compressor and mounted a pulley and sprocket on the compressor so the fan still went round.) There are, so far as I know, 2 sorts of link belts. The old style held together with rivets or similar. The rivet heads sit deeper in the groove than a normal V belt, and while they are designed around the groove standards for new pulleys without bottoming out, the rivets tend to sit on the bottom of the groove once the pulley becomes a bit worn. At that point, friction disappears almost entirely. You can either get a new pulley or deepen the bottom of the groove to refresh the clearance. The other sort, of which I hasten to add, I have no experience, uses a T shaped extension of each link as the joining component. If you are trying to run link belt over a flat belt pulley, skidding and probably also pulley damage is highly likely. Many years ago, British Rail trains were fitted with a lot of link belts on Diesel Multiple Units, driving the likes of fans, exhausters and dynamos. We also had them as a stores item to replace the V belts on loco hauled coaches and the trailer cars of DMUs that had axle driven alternators. These coaches were fitted with a spare set of normal V belts under a cover on the axle pulley, and you used those once the new ones fitted at each wheelset change expired. When the reserve set expired (I think the pulleys were 6 row) you had to resort to link belts unless you could find another excuse for taking the axle down to slip a set of endless belts (and spares if you had any sense) over the end. Anybody who had a legitimate cause for walking the track, as I did when on call for breakdowns back in the late 70s / early 80s, could collect miles of the dam stuff that had fallen off trains. Eddie
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Re: Depth of cuts
开云体育Hows your spindle bearings ? Have you done the test by using a
rod through the spindle hole & lifting the rod to see what
your clearances are ? Whats your finished product look like ? Like
everyone else says you should be able to do better than your
getting right now . I've been using HSS inserts from H R Warner
for years now & I have absolutely no problem getting 0.030
& sometimes more in most things except for some mystery metal
I have ended up using . I'm using a regular v-belt on the
countershaft motor to large pulley , & a composite flat belt
on the cone pulleys . See if theres a industrial belting company
in your neck of the woods & visit them & have them make
you a belt . I think I paid 10 bucks for mine . The oil on your
belts does need to get fixed somehow . animal On 6/25/23 8:32 PM, Mike Poore wrote:
.050 should be obtainable on a SB9. |
Re: Depth of cuts
开云体育.050 should be obtainable on a SB9.If the belt is slipping, you should try to increase the tension first. Link belts are usually not a problem. Disconnect the belts and confirm that the spindle turns freely. Large diameter work is more likely to cause slipping due to the torque required. Try back gear for large diameter work. On 6/25/2023 4:13 PM, Steven Schlegel
wrote:
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Re: Depth of cuts
开云体育Do you have the setup with the V belt pulley on the motor and a large flat pulley on the countershaft? Looks strange but this was standard. I'm a great fan of the link belts for V-belt pulleys. I've had one long time no problem on a wood lathe. Link belt on a flat pulley sounds like a problem to me but I have no direct experience. A V belt in a V groove wedges in and gets good traction. A regular V belt works well enough on that big, flat, pulley because there is so much surface area in contact. So yes, changing that belt sounds to me like a reasonable thing
to try. On 6/25/23 16:13, Steven Schlegel
wrote:
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Re: Depth of cuts
Can you share some photos of your belt setup? In particular, the area with the bearing that's throwing oil. I had similar problems with belt slipping, and just had to tighten it up; but I haven't had any issues with getting lubricant on the drive pulleys (and I recall a recent thread about that... I'm assuming that was also your lathe.) Seeing some details would definitely help. --Rogan On Sun, Jun 25, 2023 at 1:13?PM Steven Schlegel <sc.schlegel@...> wrote:
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Re: Depth of cuts
开云体育Wow. Lots of questions. One fact is really obvious. My machine operator pair should take cuts 10x deeper than I am.
The lathe head and all associated gearing is good. It was recently rebuilt and all pins, etc. were replaced correctly. Of that I am pretty certain. The drive unit moves freely, was also rebuilt, and operates correctly.?
Speeds are from the ebay chart I bought. The HSS tools I grind are based upon lots of videos I watch. I bought a jig to help get the angles correct. My carbide are inserts, many are still the original chinesium, but are being replaced
by higher quality as they die. I use a Boxer quick change toolpost.
Now, here is where I feel the problem lies since I do not have the power to make deep cuts:?
I use a link belt on the motor. It slips especially as oil gets on it. The bearing in the drive unit slings oil. The drive belt to the lathe head is a serpentine auto belt. It seems to transfer power efficiently. The drive unit is mounted
on channel so it's adjustable.??
I am wondering about switching to an auto v-belt for the motor. Next, could the channel be flexing? It is the kind used to support conduit.
Thanks,
Steven Get From: [email protected] <[email protected]> on behalf of Davis Johnson <davis@...>
Sent: Sunday, June 25, 2023 12:04:57 PM To: [email protected] <[email protected]> Subject: Re: [SouthBendLathe] Depth of cuts ?
What sort of carbide are you using? I've never had good luck with the 0 degree rake brazed carbide. I hear that it wants to run really fast. On 6/25/23 14:24, Brandon Corey wrote:
0.002” is way too low. ?I run 0.015”-0.020” at a minimum for the hardest materials. ?Material? ?Speeds? ?What size is your motor? |
Re: Depth of cuts
If the spindle is slowing or stopping either: 1. the motor is not powerful enough (1/4 should do better, 1/2 is plenty)? 2. the belt is slipping on a pulley or? 3. a pulley is slipping on a shaft( bull gear pin not engaged or a broken\missing key or pin on some other gear.
When the spindle stops is the motor still turning?? With the motor unplugged run the toolpost into contact with the chuck and try to turn the motor pulley by hand and see where the motion stops. On a 9 inch lathe with 1/2 hp HSS cutters should easily cut .050.? When using carbide be sure use positive rake cutters and smaller depths. |
Re: Depth of cuts
开云体育What sort of carbide are you using? I've never had good luck with
the 0 degree rake brazed carbide. I hear that it wants to run
really fast. On 6/25/23 14:24, Brandon Corey wrote:
0.002” is way too low. ?I run 0.015”-0.020” at a minimum for the hardest materials. ?Material? ?Speeds? ?What size is your motor? |
Re: Depth of cuts
开云体育0.002” is way too low. ?I run 0.015”-0.020” at a minimum for the hardest materials. ?Material? ?Speeds? ?What size is your motor?Brandon
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Re: Depth of cuts
开云体育I regularly take .050 on my 9A Two variables to look at - feeds and speeds. Try feeding slower. Make sure your RPM is right for the diameter - your SFPM (surface feet per minute). This can make a HUGE difference. The Is-It-Plugged in question - is the bull gear pin that pins
the spindle to the headstock pulley in place? What else slows down? The motor, the
countershaft?
On 6/25/23 00:03, David R8 wrote:
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Re: SB 16" for sale in North of England
It's in better shape than my Heavy 10L. Longer bed, too. Says "May not post to the United States" so I'm out of luck... I'm also having enough trouble stuffing the stuff I already have in my so-called shop. Hope someone who'll love it can get it. Bill in OKC William R. Meyers, MSgt, USAF(Ret.) Aphorisms to live by: Good judgement comes from experience. Experience comes from bad judgement.? SEMPER GUMBY! Physics doesn't care about your schedule. The only reason I know anything is because I've done it wrong enough times to START to know better. Expect in one hand, expectorate in the other. See which one gets full first.
On Saturday, June 24, 2023 at 10:10:37 PM CDT, Steven Schlegel <sc.schlegel@...> wrote:
What a shame. All that rust.
Get From: [email protected] <[email protected]> on behalf of eddie.draper@... via groups.io <eddie.draper@...>
Sent: Saturday, June 24, 2023 12:09:57 PM To: [email protected] <[email protected]> Subject: [SouthBendLathe] SB 16" for sale in North of England ?
Anybody interested? On ebay. I have no connection with the vendor or ebay.
https://www.ebay.co.uk/itm/295762637622?_trkparms=amclksrc%3DITM%26aid%3D1110003%26algo%3DSPLICE.IMAGESIM%26ao%3D1%26asc%3D20200818141841%26meid%3Df92eff385a5a433583df4a0127ed8ca1%26pid%3D101112%26rk%3D1%26rkt%3D12%26sd%3D125987539241%26itm%3D295762637622%26pmt%3D1%26noa%3D0%26pg%3D2349624%26algv%3DImageSimWithSimv9Limev2CacheOnly&_trksid=p2349624.c101112.m1982&amdata=cksum%3A295762637622f92eff385a5a433583df4a0127ed8ca1%7Cenc%3AAQAIAAABAFyvRHL9pwWmSo5mFpt6yvq3U5yAdIfOufmTAr6ViClr8WoFkrymmkGtY%252Bhq1v6%252BJbRMfjniUX4KR%252FL%252BeFTbVWEcd5PdntzZUik3ARQao51JG4jTo0vw3jUISavlPAEvRNJvdCA%252BznFHm3dCGjdnht4%252FHevS%252FiJpXuxBbReltW%252BfQf6693crK6znWvCCbrOow%252BPgA9ixjqk8lCV00Mn9Xss84AaQK%252FzlTVC8qcJHMvLwMIPg%252FBgfOqYFjJ10J%252FKR9lgnAWMDXfhNUe5cAVU93N3MUWNcfCfx%252F8%252BUJXPzaFFzmZEmeOjR2fSKL%252F4gzBrziXAMe2y5K7nWDUjfbtjKEvU%253D%7Campid%3APL_CLK%7Cclp%3A2349624
Eddie |