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Slitting on a Unimat SL? #db200

Steve Johnson
 

I am casting a new motor mount for an SL Unimat. I'll be using green sand, cope/drag, and as such I will have to cast it with the slot/slit(?) on the clamp side filled in. I'm at a loss trying to figure out the best way to cut this back in after casting. Band saw? Too thin. Table saw? Too thick. Unimat? I don't know where to begin.

So this is what the original motor mount looks like:


This is the printed 'positive', and is what the aluminum casting will look like:


Thoughts?
Re: Unimat black crackle jig-saw

 

Did any one repaint a black crackle?

And how did it looks like?

I'm planning to do some repainting with black crackle (or wrinkle)
Re: Unimat black crackle jig-saw

 

¿ªÔÆÌåÓý

Unlike the hammered ¡®stuff¡¯, good news is that this is an easy one to match. I just brought the same piece off my MK2 as shown in your photo to a local Paint shop (in my case ?one catering to the trade but any place who color matches and mixes should be fine). They measured the color and mixed up a batch for me that I could pick up the following day.

?

Friendly regards,

Alan

?

From: [email protected] <[email protected]> On Behalf Of John Hutnick
Sent: Wednesday, April 5, 2023 4:14 PM
To: Steve Jaynes <srjaynes@...>; [email protected]
Subject: Re: [Unimat] Unimat black crackle jig-saw

?

Re the comments from Mr. Jaynes, here is a piece from Ebay showing Unimat gray.
Does anyone have this color???

Re: Groups.io Problem

 

Fred,
Your sign in works for me. I will be using the complete address from now on.
Thanks
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
Re: Groups.io Problem

Steve Johnson
 

This is what my shortcut points to, works great:

/g/Unimat/topics
Re: Groups.io Problem

 

Bill,
I have always typed ¡°groups.io¡±with no issues. As of three days ago this no longer works for me. Apparently I have have been getting away with doing it this way but no longer works.
Dick
--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
Re: Groups.io Problem

 

I used? /g/Unimat to get to home page
then clicked on messages

Tried it on an android phone shows black date with arrow top right hand side

Fred
Re: Groups.io Problem

 

Hi Dick,

No problems here. Check the top right corner of the screen 'Date' and make sure you're viewing posts starting at 1 (eg. 1-20).
Re: Groups.io Problem

 

Surprised I'm not seeing it that way on my tablet. That's about where my thumb rests when I'm holding the tablet. :)

Bill in OKC?
Re: Groups.io Problem

 

How are you getting to group.io? Clicking a link, or typing it in? I'm not seeing it that way on my android tablet, will be checking it on my phone and computer shortly. I was typing in the link.?

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!
Improvise, Adapt, and Overcome.
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 Tuesday, April 18, 2023 at 07:39:14 AM CDT, OldToolmaker via groups.io <old_toolmaker@...> wrote:


I have been experiencing difficulties with groups.II in the last few days.
When I open the groups site I am finding I am viewing postings from the year 2000.
Am I doing something wrong?
Anyone else experiencing this or is it just me?

--
http://www.homemadetools.net/ forum/?OFF- SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI- LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION

Re: Groups.io Problem

 

Could be on messages page at top right hand side is blue "Date" with little arrow changes start from first to latest

Fred
Re: Dead Center stuck in tailstock ram.

 

Anything that evaporates quickly will work in a pinch. A quick search for "spray cooler for electronics" brought up several from MG Chemical & others. Dad used ether cold starting spray a few times when I was a kid. Check Amazon, your local electronics store, et cetera. The spray coolers in the search won't leave a residue. Almost essential for electronics.

Bill in OKC?
Re: Dead Center stuck in tailstock ram.

Martin Potter VE3OAT
 

Bill in OKC too suggested :
"... dry ice if you can find it ..."

Or, some electronics parts stores sell a spray-on cooling agent for
testing the temperature behaviour of small electronic parts.? Some of
these are quite good, although they might not induce as low a
temperature as dry ice.? Sorry that I don't know the brand names or
models of any of them, but one of them might be a good enough
substitute for dry ice.

In any case, Good Luck with your problem.

... Martin
Groups.io Problem

 

I have been experiencing difficulties with groups.II in the last few days.
When I open the groups site I am finding I am viewing postings from the year 2000.
Am I doing something wrong?
Anyone else experiencing this or is it just me?

--
http://www.homemadetools.net/forum/?OFF-SET-tailstock-center-65965#post105972
?SMALL TURRET TOOL POST PLANS?
?LARGE TURRET TOOL POST PLANS
?MINI-LATHE CARRIAGE LOCK PLANS
?SMALL QC TOOL POST PLANS?
?QUICK CHANGE LATHE TURRET
?MINI LATHE COMPOUND PIVOT MODIFICATION
Re: Casting an aluminum motor mount for DC motor upgrade

Steve Johnson
 

Ah, different meanings for rotary valve. Mine is for multiplexing the dust collection input lines (3:1) to the cyclone, selecting the line based on current sensed from a tool that has been powered on. So instead of a manual blast gate at each device/station, the blast gates are replaced by the rotating 3:1 valve. When a tool is turned off (current no longer sensed), the controller leaves the suction (and valve selection) on for 10 seconds to clear dust out of the line.

I guess I don't generate that much sawdust, I've yet to empty the bin. I think it is around 15-20 gallons. The lid lifts off easily and I have acrylic discs as viewports to see how full it is.
Re: Dead Center stuck in tailstock ram.

 

Make 2 wedges approx 10¡ã? with a slot in the middle the same diameter as the? exposed dead center. Squeeze them towards each in a vise between the dead center head and the tailstock barrel and they will force the center out. Here is a video from Mr Pete showing everything.
https://youtu.be/AtNM8-VUvrg
Re: Dead Center stuck in tailstock ram.

 

Was actually thinking of drilling a small bore hole through from the back of the ram, and tapping it out with a small drift¡­
Issue would be how hard is the ram itself gonna be, can it be easily drilled. It¡¯s probably surface hardened as it¡¯s a sliding surface, but perhaps not through?

Jeff
Re: Dead Center stuck in tailstock ram.

 

Sometimes with these old machines the old oil drys and acts a bit like glue. Try soaking the part in petrol (gasoline) or paint thinners. This will dissolve the oil pretty quickly.

If it is still stuck its likely to be rusted in place. In that case try some heat to the outside.
Re: Dead Center stuck in tailstock ram.

 

Use a piece of ice, or dry ice if you can find it, heat the tailstock ram, and use the ice to cool the center. Or take the patient way, and spray it with copious amounts of WD-40, or PB Blaster, and let it sit. Try to twist it every now and then. If it give, great! If not, spray it again! Then wait a few hours and try to move it again. Twisting force is most likely to help. Back and forth until it comes loose. Might take a week or so of alternate spraying with penetrating oil or something to dissolve the rust that may have formed, and trying to move it. Took a couple of weeks on tailstock for my lathe hitting it with alternating WD-40 & PB-Blaster, and twisting the center.?

Guy who documented his travails with this on a larger lathe hung a weight off a lever clamped to the center, and eventually the spraying penetrating oil loosened it enough that one morning he came out to find the center had twisted from the hanging weight.?

You could cycle through both methods, if it's a really old, really stuck center.?

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!
Improvise, Adapt, and Overcome.
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 Monday, April 17, 2023 at 03:38:56 PM CDT, rcjge <jgpedwards@...> wrote:


Hey Folks

picked up a second Unimat SL and their is a a dead Center jammed in the tailstock ram.?

Tried really high quality oil to loosen, not budged so far. Held dead centre in bench vise soft jaws, still couldn¡¯t budge. Not much leverage mind since ram is out of tailstock. May have to reinstall ram in TS cast clamp tight and use for leverage with dead center held by vise¡­?
Anyone been here?
Turns out tailstock ram is partly solid.
thinking of heating the ram some hoping it expands faster than dead center and loosen that way¡­ ?

thoughts anyone?..

thanks,
Jeff

?
Re: Milling table differences between Unimat 3 and DB200/SL1000 versions¡­

 

Thanks Matt!

Jeff
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