# Mug LTD top plate Ø90 with rod guide and a 5 mL glass syringe socket

> How do I mount a glass syringe on a small LTD Stirling engine top plate?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: My geometry: the LTD kit's top plate scaled to Ø90, with the socket drawn at the 5 mL glass barrel's published OD (Ø15.40, KD Scientific)
- Page: https://xemstudio.com/objects/mug-ltd-top-plate/ · JSON: https://xemstudio.com/api/geometry?object=mug-ltd-top-plate · Plain text: https://xemstudio.com/objects/mug-ltd-top-plate/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**Exact dimensions.** Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part.

## Notes

- Rod guide: Ø2 bore 13 long through the 3 mm plate and the Ø20 × 10 boss; the 2 mm displacer rod runs in it (that close fit is the seal).
- Syringe socket at x 35: Ø15.40 × 12 deep in a Ø18.4 boss, floor 9 above the plate's underside; the barrel's end sits on the floor and its Luer cone (7.5 long) stands in the Ø5 port below, its tip 1.5 above the plate's underside, so nothing reaches into the chamber. The port's outer edge is at R37.5, inside the Ø76 bore.
- 7 × Ø3.4: five chamber screws on R41 and two for the crank pedestal's foot at (35.5, ±20.5).

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| rod-guide bore | Ø2 × 13 | Ø2 displacer rod (slides through it) | run | all |
| syringe socket | Ø15.40 × 12 | 5 mL glass syringe barrel | socket | all |
| Luer port | Ø5 | Luer cone (no contact) | designed | all |
| screw holes | Ø3.4 × 7 | M3 clearance | designed | all |

## Sizes

| feature | size_mm |
|---|---|
| plate | Ø90 × 3 |
| rod guide | Ø2 × 13 |
| syringe socket | Ø15.40 × 12, floor at 9, x 35 |
| port | Ø5 |

## Where the files are

- Atlanta Vinyl Store: [Premium 11 oz sublimation mug: 3.75 in H × 3.25 in D](https://atlantavinylstore.com/products/premium-11oz-sublimation-mugs) — web — listing (verify at link)
- James R. Senft: [An Introduction to Low Temperature Differential Stirling Engines](https://www.stirlingengine.com/) — book — Moriya Press (verify at link)
- Wikipedia: [Stirling engine](https://en.wikipedia.org/wiki/Stirling_engine) — web — CC BY-SA 4.0 (text)
- KD Scientific: [Full Line of Glass Syringes, rev. A (order codes 78-0871 to 78-0880): piston OD, barrel OD D1, barrel collar D2, piston collar D3, length L](https://www.kdscientific.com/media/brochures/KDS%20Glass%20Syringe%20Datasheet.pdf) — PDF — manufacturer datasheet (verify at link)
- Long Earth Society: [Engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/mug-ltd-top-plate/index.json

- mug-ltd-top-plate-90-glass5: [STEP](https://xemstudio.com/files/hardware/mug-ltd-top-plate/mug-ltd-top-plate-90-glass5.step) · [STL](https://xemstudio.com/files/hardware/mug-ltd-top-plate/mug-ltd-top-plate-90-glass5.stl) — top (cold) plate Ø90 × 3: Ø2 rod-guide bore 13 long through the plate and a Ø20 × 10 boss; Ø15.40 socket for the 5 mL glass syringe barrel at x 35 (floor 9 above the plate's underside, 12 deep, Ø18.4 boss) over a Ø5 port; 7 × Ø3.4

## Questions

**Which syringe fits the mug LTD's socket?**

The 5 mL all-glass syringe (barrel Ø15.40); the socket is drawn at that OD exactly.

## Fits with

- [Build list: Mug LTD (sits on a coffee mug)](https://xemstudio.com/objects/list-ltd-mug/)
- [LTD Stirling bottom plate, Ø120 and Ø170](https://xemstudio.com/objects/ltd-bottom-plate/)
- [LTD Stirling top plate with syringe socket, Ø120 and Ø170](https://xemstudio.com/objects/ltd-top-plate/)
- [Glass syringes 1–50 mL (all-glass, ground-glass plunger): barrel and plunger](https://xemstudio.com/objects/glass-syringes/)